WATCH: BBC interviewed Ukrainian refugees in Poland: ‘We are forever grateful’
Rescuers look for survivors after Russian theater bombing
White House warns Russia against using chemical, biological weapons in Ukraine
Videos show massive fire, smoke rising after Mariupol theater hit by Russian airstrike
British Prime Minister Boris Johnson met with President of Ukraine Volodymyr Zelensky during his surprise visit to Kyiv. Anadolu Agency via Getty Images
By Denis Okunev and Yulia Kesaieva, CNN
Updated 12:27 PM ET, Thu March 17, 2022
(CNN) The BBC has interviewed Ukrainian refugees who fled their war-ravaged country and found shelter in Poland.
In a documentary film titled .