President of Ukraine Runs to Protect himself at the Front Against Russia, a CNN Exclusive | Video | CNN

As tensions with Russia escalate, CNN gained unprecedented access to the Ukrainian president on the front line on the Donbas front in eastern Ukraine.

The Ukrainian military told CNN that they estimate that more than 50,000 Russian soldiers are concentrated near the border.

US President Biden's words of support are not enough: Zelensky tells CNN's Matthew Chance that Ukraine needs more help from Washington and crucial backing to join NATO.