'Will respond decisively': Joe Biden warns Putin again over invading Ukraine

US President Joe Biden on Sunday reassured his Ukrainian counterpart Volodymyr Zelensky that Washington "will respond decisively" if Russia moves to invade its pro-Western neighbor, the White House said in a statement. With a Russian military buildup on Ukraine's borders, Biden "made clear" to Zelensky during a phone call that the "United States and its allies and partners will respond decisively if Russia further invades Ukraine". The show of US support for Ukraine comes days after Biden warned Russian President Vladimir Putin of severe consequences if Moscow launches a military invasion. Watch this video for more.