Video Loading Video Unavailable Click to play Tap to play The video will auto-play soon 8 Cancel Play now As we approach a month since Russia launched a brutal invasion of Ukraine , the US president says that there are 'clear signs' that Russian President Vladimir Putin may be preparing to use biological and chemical weapons . Speaking at an event on Monday, US President Joe Biden said that Russia 's false accusation that Ukraine has biological and chemical weapons is a "clear sign" that Vladimir Putin is considering using them himself. He also said that it's "not true" that...