>> reporter: so, we're seeing now a multi-pronged attack on different cities. the city of hassan has fallen. the first ukrainian city to go to russian control. although they say there is still some resistance in the city. the city of mariupol is under attack. the biggest one, of course, is kyiv, the capitol, home to 3 million people and the government is a city a that zelenskyy said a short time ago he does not intend to leave. he wants to stay and continue to lead the government and lead a resistance against the russian military onslaught. so far there have been air strikes in kyiv. most of the fighting, however, remains on the out skirts of the city and that convoy, ukrainians