In IDE:

1. open /admin/index.php file for editing
2. replace the $application->Run(); line with below code:

/** @var kCountryStatesHelper $country_state_helper */
$country_state_helper = $application->recallObject('CountryStatesHelper');
echo $country_state_helper->getCountryIso('USA') . ';';
echo $country_state_helper->getCountryIso('US', true) . ';';
echo $country_state_helper->getCountryIso('RUS') . ';';
echo $country_state_helper->getCountryIso('RU', true) . ';';

3. save changes

In Admin Console:

1. go to Admin Console
2. confirm, that US;USA;RU;RUS; text is displayed
3. confirm, that in Debugger contains one SQL statement from the CountryStates table
4. reload the page
5. confirm, that US;USA;RU;RUS; text is displayed
6. confirm, that in Debugger contains no SQL statements from the CountryStates table