Joe Biden warns Vladimir Putin over any military action against Ukraine
ABCUS President Joe Biden vows to make it "very, very difficult" for Russian President Vladimir Putin to take military action in Ukraine, saying his administration is putting together a comprehensive set of initiatives to curb Russian aggression. Key points: The international community has been watching the build-up of troops at the Russia-Ukraine border closely Russia says the US is considering imposing sanctions on them, which the Kremlin said would lead to a response Presidents Joe Biden and Vladimir Putin are expected to hold a conversation in the coming weeks Mr Biden offered the measured warning to Mr Putin amid growing concern about a build-up of troops on the Ukrainian border and increasingly bellicose rhetoric from the Kremlin. Russian troops at Ukraine border Photo shows A convoy of Ukrainian armed forces prepare to pull back from Debaltseve in eastern Ukraine Fears of a Russian military attack on neighbouring Ukraine are growing amongst the international community, as the Kremlin continues its build-up of troops on the border. Mr Blinken said the US had "made it clear to the Kremlin that we will respond resolutely, including with a range of high-impact economic measures that we've refrained from using in the past".