diff --git a/assets/css/src/components/_importExport.scss b/assets/css/src/components/_importExport.scss
index 047f0f39eb..c0e67b7528 100644
--- a/assets/css/src/components/_importExport.scss
+++ b/assets/css/src/components/_importExport.scss
@@ -99,6 +99,10 @@ tr {
   }
 }
 
+.mailpoet_subscribers_data_parse_results_details_show {
+  cursor: pointer;
+}
+
 .mailpoet_import_validation_step {
   display: flex;
   flex-direction: column;
diff --git a/assets/js/src/subscribers/importExport/import-old.jsx b/assets/js/src/subscribers/importExport/import-old.jsx
index 9354f279f1..54f0ac0fb0 100644
--- a/assets/js/src/subscribers/importExport/import-old.jsx
+++ b/assets/js/src/subscribers/importExport/import-old.jsx
@@ -11,97 +11,19 @@ import StepInputValidation from './import/step_input_validation.jsx';
 import StepMethodSelection from './import/step_method_selection.jsx';
 import StepResults from './import/step_results.jsx';
 
-const SUBSCRIBERS_LIMIT_FOR_VALIDATION = 500;
-
-function getDataManipulationPreviousStepLink(importData) {
-  if (importData === undefined) {
-    return 'step_method_selection';
-  }
-  if (importData.subscribersCount === undefined) {
-    return 'step_method_selection';
-  }
-  if (importData.subscribersCount < SUBSCRIBERS_LIMIT_FOR_VALIDATION) {
-    return 'step_method_selection';
-  }
-  return 'step_input_validation';
-}
 
 jQuery(document).ready(() => {
-  if (!jQuery('#mailpoet_subscribers_import').length) {
-    return;
-  }
-  jQuery('input[name="select_method"]').attr('checked', false);
-  // configure router
-  const router = new (Backbone.Router.extend({
-    routes: {
-      '': 'home',
-      step_method_selection: 'step_method_selection',
-      step_input_validation: 'step_input_validation',
-      step_data_manipulation: 'step_data_manipulation',
-      step_results: 'step_results',
-    },
-    home() {
-      this.navigate('step_method_selection', { trigger: true });
-    },
-  }))();
-
-  function showCurrentStep() {
-    MailPoet.Notice.hide();
-    MailPoet.Modal.loading(false);
-    jQuery('#mailpoet_subscribers_import > div[id^="step"]').hide();
-    jQuery(window.location.hash).show();
-  }
-
-  router.on('route:step_method_selection', () => {
-    showCurrentStep();
-
-    const container = document.getElementById('step_method_selection');
-
-    if (container) {
-      ReactDOM.render(
-        <StepMethodSelection
-          navigate={router.navigate}
-        />,
-        container
-      );
-    }
-  });
-
-  router.on('route:step_input_validation', () => {
-    if (typeof (window.importData.step_method_selection) === 'undefined') {
-      router.navigate('step_method_selection', { trigger: true });
-      return;
-    }
-    showCurrentStep();
-    const container = document.getElementById('step_input_validation');
-
-    if (container) {
-      ReactDOM.render(
-        <StepInputValidation
-          navigate={router.navigate}
-          importData={window.importData.step_method_selection}
-        />,
-        container
-      );
-    }
-  });
 
   router.on('route:step_data_manipulation', () => {
     let fillerPosition;
-    let importResults;
-    let duplicates;
-    if (typeof (window.importData.step_method_selection) === 'undefined') {
-      router.navigate('step_method_selection', { trigger: true });
-      return;
-    }
+
     // define reusable variables
     const nextStepButton = jQuery('#next_step');
-    const previousStepButton = jQuery('#return_to_previous');
+
     // create a copy of subscribers object for further manipulation
     const subscribers = jQuery.extend(true, {}, window.importData.step_method_selection);
     const subscribersDataTemplate = Handlebars.compile(jQuery('#subscribers_data_template').html());
     const subscribersDataTemplatePartial = Handlebars.compile(jQuery('#subscribers_data_template_partial').html());
-    const subscribersDataParseResultsTemplate = Handlebars.compile(jQuery('#subscribers_data_parse_results_template').html());
     const segmentSelectElement = jQuery('#mailpoet_segments_select');
     const maxRowsToShow = 10;
     const filler = '. . .';
@@ -110,8 +32,6 @@ jQuery(document).ready(() => {
     const fillerArray = Array(...new Array(subscribers.subscribers[0].length))
       .map(String.prototype.valueOf, filler);
 
-    showCurrentStep();
-
     function toggleNextStepButton(condition) {
       const disabled = 'button-disabled';
       if (condition === 'on') {
@@ -125,61 +45,6 @@ jQuery(document).ready(() => {
     jQuery('#subscribers_data_parse_results:visible').html('');
     jQuery('#subscribers_data_import_results:visible').hide();
 
-    // show parse statistics if any duplicate/invalid records were found
-    if (subscribers.invalid.length || subscribers.duplicate.length || subscribers.role.length) {
-      // count repeating e-mails inside duplicate array and present them in
-      // 'email (xN)' format
-      duplicates = {};
-      subscribers.duplicate.forEach((subscriberEmail) => {
-        duplicates[subscriberEmail] = (duplicates[subscriberEmail] || 0) + 1;
-      });
-      subscribers.duplicate = [];
-      Object.keys(duplicates).forEach((email) => {
-        if (duplicates[email] > 1) {
-          subscribers.duplicate.push(`${email} (x${duplicates[email]})`);
-        } else {
-          subscribers.duplicate.push(email);
-        }
-      });
-
-      importResults = {
-        notice: MailPoet.I18n.t('importNoticeSkipped').replace(
-          '%1$s',
-          `<strong>${subscribers.invalid.length + subscribers.duplicate.length + subscribers.role.length}</strong>`
-        ),
-        invalid: (subscribers.invalid.length)
-          ? MailPoet.I18n.t('importNoticeInvalid')
-            .replace('%1$s', `<strong>${subscribers.invalid.length.toLocaleString()}</strong>`)
-            .replace('%2$s', subscribers.invalid.join(', '))
-          : null,
-        duplicate: (subscribers.duplicate.length)
-          ? MailPoet.I18n.t('importNoticeDuplicate')
-            .replace('%1$s', `<strong>${subscribers.duplicate.length}</strong>`)
-            .replace('%2$s', subscribers.duplicate.join(', '))
-          : null,
-        role: (subscribers.role.length)
-          ? MailPoet.I18n.t('importNoticeRoleBased')
-            .replace('%1$s', `<strong>${subscribers.role.length.toLocaleString()}</strong>`)
-            .replace('%2$s', subscribers.role.join(', '))
-            .replace(
-              /\[link](.+)\[\/link]/,
-              '<a href="https://kb.mailpoet.com/article/270-role-based-email-addresses-are-not-allowed" target="_blank" rel="noopener noreferrer">$1</a>'
-            )
-          : null,
-      };
-      jQuery('#subscribers_data_parse_results').html(
-        subscribersDataParseResultsTemplate(importResults)
-      );
-    }
-
-    jQuery('.mailpoet_subscribers_data_parse_results_details_show')
-      .click(function detailsClick() {
-        const details = jQuery('.mailpoet_subscribers_data_parse_results_details');
-        details.toggle();
-        jQuery(this).text((details.is(':visible'))
-          ? MailPoet.I18n.t('hideDetails')
-          : MailPoet.I18n.t('showDetails'));
-      });
 
     // show available segments
     if (window.mailpoetSegments.length) {
@@ -610,12 +475,6 @@ jQuery(document).ready(() => {
         filterSubscribers();
       });
 
-    previousStepButton.off().on('click', () => {
-      router.navigate(
-        getDataManipulationPreviousStepLink(window.importData.step_method_selection),
-        { trigger: true }
-      );
-    });
 
     nextStepButton.off().on('click', (event) => {
       const columns = {};
diff --git a/assets/js/src/subscribers/importExport/import/step_data_manipulation.jsx b/assets/js/src/subscribers/importExport/import/step_data_manipulation.jsx
index cdf289c2d9..03554fd5d2 100644
--- a/assets/js/src/subscribers/importExport/import/step_data_manipulation.jsx
+++ b/assets/js/src/subscribers/importExport/import/step_data_manipulation.jsx
@@ -2,6 +2,7 @@ import React, { useEffect } from 'react';
 import PropTypes from 'prop-types';
 import { withRouter } from 'react-router-dom';
 import PreviousNextStepButtons from './previous_next_step_buttons.jsx';
+import Warnings from './step_data_manipulation/warnings.jsx';
 
 function getPreviousStepLink(importData, subscribersLimitForValidation) {
   if (importData === undefined) {
@@ -32,6 +33,9 @@ function StepDataManipulation({
 
   return (
     <>
+      <Warnings
+        stepMethodSelectionData={stepMethodSelectionData}
+      />
       <PreviousNextStepButtons
         canGoNext={false}
         onPreviousAction={() => (
diff --git a/assets/js/src/subscribers/importExport/import/step_data_manipulation/warnings.jsx b/assets/js/src/subscribers/importExport/import/step_data_manipulation/warnings.jsx
index e69de29bb2..762a10df4c 100644
--- a/assets/js/src/subscribers/importExport/import/step_data_manipulation/warnings.jsx
+++ b/assets/js/src/subscribers/importExport/import/step_data_manipulation/warnings.jsx
@@ -0,0 +1,117 @@
+import React, { useState } from 'react';
+import PropTypes from 'prop-types';
+import MailPoet from 'mailpoet';
+import ReactStringReplace from 'react-string-replace';
+import classNames from 'classnames';
+
+const getSingleWarning = (warningTranslation, subscribers) => {
+  let warning = '';
+  if (subscribers.length) {
+    warning = ReactStringReplace(
+      warningTranslation.replace('%2$s', subscribers.join(', ')),
+      '%1$s',
+      () => <strong key={warningTranslation}>{subscribers.length.toLocaleString()}</strong>
+    );
+    warning = <p>{warning}</p>;
+  }
+  return warning;
+};
+
+const Warnings = ({
+  stepMethodSelectionData,
+}) => {
+  const { invalid, duplicate, role } = stepMethodSelectionData;
+
+  const [detailsShown, setDetailsShown] = useState(false);
+
+  const detailClasses = classNames(
+    'mailpoet_subscribers_data_parse_results_details',
+    { mailpoet_hidden: !detailsShown },
+  );
+
+  const invalidWarning = getSingleWarning(MailPoet.I18n.t('importNoticeInvalid'), invalid);
+
+  const duplicateWarning = getSingleWarning(MailPoet.I18n.t('importNoticeDuplicate'), duplicate);
+
+  let roleBasedWarning = '';
+  if (role.length) {
+    roleBasedWarning = ReactStringReplace(
+      MailPoet.I18n.t('importNoticeRoleBased'),
+      /(%1\$s|\[link\].*\[\/link\]|%2\$s)/,
+      (match) => {
+        if (match === '%1$s') return <strong key="role-length">{role.length.toLocaleString()}</strong>;
+        if (match === '%2$s') return role.join(', ');
+        return (
+          <a
+            href="https://kb.mailpoet.com/article/270-role-based-email-addresses-are-not-allowed"
+            target="_blank"
+            rel="noopener noreferrer"
+            key={match}
+          >
+            {match.replace('[link]', '').replace('[/link]', '')}
+          </a>
+        );
+      }
+    );
+    roleBasedWarning = <p>{roleBasedWarning}</p>;
+  }
+
+  if (
+    invalid.length
+    || duplicate.length
+    || role.length
+  ) {
+    const allWarningsCount = invalid.length + duplicate.length + role.length;
+    return (
+      <div className="error">
+        <p>
+          {ReactStringReplace(MailPoet.I18n.t('importNoticeSkipped'), '%1$s', () => (
+            <strong key="lengths">{allWarningsCount.toLocaleString()}</strong>
+          ))}
+          {' '}
+          <a
+            className="mailpoet_subscribers_data_parse_results_details_show"
+            data-automation-id="show-more-details"
+            onClick={() => setDetailsShown(!detailsShown)}
+            role="button"
+            tabIndex={0}
+            onKeyDown={(event) => {
+              if ((['keydown', 'keypress'].includes(event.type) && ['Enter', ' '].includes(event.key))
+              ) {
+                event.preventDefault();
+                setDetailsShown(!detailsShown);
+              }
+            }}
+          >
+            {MailPoet.I18n.t('showMoreDetails')}
+          </a>
+        </p>
+        <div className={detailClasses}>
+          <hr />
+          {invalidWarning}
+          {duplicateWarning}
+          {roleBasedWarning}
+        </div>
+      </div>
+    );
+  }
+  return null;
+};
+
+Warnings.propTypes = {
+  stepMethodSelectionData: PropTypes.shape({
+    duplicate: PropTypes.arrayOf(PropTypes.string),
+    invalid: PropTypes.arrayOf(PropTypes.string),
+    role: PropTypes.arrayOf(PropTypes.string),
+  }),
+};
+
+Warnings.defaultProps = {
+  stepMethodSelectionData: {
+    invalid: [],
+    duplicate: [],
+    role: [],
+  },
+};
+
+export default Warnings;
diff --git a/views/subscribers/importExport/import.html b/views/subscribers/importExport/import.html
index 749f3107fb..3e039baf4c 100644
--- a/views/subscribers/importExport/import.html
+++ b/views/subscribers/importExport/import.html
@@ -105,6 +105,7 @@
 'methodMailChimpVerify': __('Verify'),
 'methodMailChimpSelectList': __('Select list(s)'),
 'methodMailChimpSelectPlaceholder': _x('Select', 'Verb'),
+'showMoreDetails': __('Show more details'),
 'pasteLabel': __('Copy and paste your subscribers from Excel/Spreadsheets'),
 'pasteDescription': __('This file needs to be formatted in a CSV style (comma-separated-values.) Look at some [link]examples on our support site[/link].'),
 'methodSelectionHead': __('How would you like to import subscribers?')
diff --git a/views/subscribers/importExport/import/step_data_manipulation.html b/views/subscribers/importExport/import/step_data_manipulation.html
index 9a22717042..0bbeed47e4 100644
--- a/views/subscribers/importExport/import/step_data_manipulation.html
+++ b/views/subscribers/importExport/import/step_data_manipulation.html
@@ -3,23 +3,6 @@
     <!-- Template data -->
   </div>
 
-  <script id="subscribers_data_parse_results_template" type="text/x-handlebars-template">
-    <div class="error">
-      <p>{{{notice}}} <a class="mailpoet_subscribers_data_parse_results_details_show" href="javascript:;" data-automation-id="show-more-details"><%= __('Show more details') %></a><p>
-      <div class="mailpoet_subscribers_data_parse_results_details mailpoet_hidden">
-        <hr>
-        {{#if duplicate}}
-        <p>{{{duplicate}}}</p>
-        {{/if}}
-        {{#if invalid}}
-        <p>{{{invalid}}}</p>
-        {{/if}}
-        {{#if role}}
-        <p>{{{role}}}</p>
-        {{/if}}
-      </div>
-    </div>
-  </script>
 
   <div class="inside">
     <br>