from msnbc world headquarters here in new york. welcome everyone to alex witt reports. we begin with breaking news, overnight vladimir putin s military facing another critical setback as this massive explosion was showing severely damage to a key bridge between crimea and russia. part of that bridge has collapsed into the sea, disrupting a main russian supply route. let s go right back to kier simmons joining us from moscow. what can you tell us about this? well alex, it s another dangerous moment in this conflict in ukraine. 48 hours after president biden mourned of the escalation could lead in his words to a nuclear conflict. well now we have this bridge attack, now the ukrainians are celebrating and not taking responsibility for it. the russians are furious. with a nuclear threat looming, a major fire on the bridge linking russia to crimea. the blaze visible for miles reports of a, huge explosion at around 6 am local time. russian authorities saying that it was a truck