>> reporter: richard weir with human rights watch says what's important is the icc is already investigating so people could be held accountable. which never happened in aleppo, for example. >> never happened. and right now the international community has an opportunity to break the cycle of impunity and finally hold those individuals to account for what they have done. >> reporter: but the process is a long one. and volodymyr says there is still time to stop another mariupol. >> i also want all the people and even mr. biden and other political guys in the nations to understand that if we fall, you're next. >> reporter: also today, the prosecutor general here in ukraine is investigating whether or not 2,000 ukrainian kids were deported to russia if that's true, that would also constitute a war crime. lester >> molly hunter, thanks. nato this evening standing by it commitment to supply ukraine with weapons and other aid, but reminding that its obligation to the beleaguered non-nato nation only goes so