on this american-made weapon helping slow the russian advance. >> it's a very destructive and very effective weapon. >> diaz: plus this weekend marks two years of the pandemic. america now racing ahead oarpt i'm lilia luciano in los angeles, where restrictions are rolling back. >> diaz: and later, pep bands return to march madness. >> this is the "cbs weekend news" from chicago with adriana diaz. >> diaz: good evening. tonight, russia is warning the united states that it would fire on weapons shipments to ukraine raising the risk of direct confrontation between moscow and a nato country. today, russian forces expanded their attacks, including strikes around kyiv. fierce ukrainian resistance has made the fight a slog. this is new video from the southern city of mariupol. it and other cities are being pound read punishing and destructive shelling and