Russian airstrike hit tank with nitric acid at a chemical factory, causing massive leak, says Sergiy Gaiday

Ukrainian president's visit comes as Russian forces said to capture city of Lyman; Zelensky vows to 'defend our land to the last man'

Ambassador Michael Brodsky in Ukrainian capital for 1st time since Russia invaded; meets with Ukrainian officials to prepare reopening of mission, which had relocated to Poland

Footage aired by CNN shows group of Russian soldiers killing two men as they walk away outside a car dealership on the outskirts of Kyiv in March

Ukrainians whose ancestors fought in World War II shrug off effort by Putin to link invasion to war by casting authorities in Kyiv as neo-Nazis

Reports say Kyiv attacked the position in Russian-controlled east shortly after it was visited by Russian military chief Gerasimov

Russian Foreign Ministry spokeswoman slams Michael Brodsky's 'flirting' after he suggests to capital's mayor that some public places be named for those who saved Jews in Holocaust

Ukrainians describe defense of Kyiv government center as Russian forces closed in, apparently aiming to capture or kill president; wife says she hasn't seen him since then

Journalist at US-funded Radio Free Europe killed in Russian missile barrage on Ukrainian capital; Zelensky accuses Moscow of trying to humiliate UN, urges 'powerful reaction'

Head of Russian state TV warns Western support of Ukraine could lead to 'total annihilation' of country; Zelensky: Putin seeks to 'disband' Europe