Biden tells Ukraine's Zelensky that US would respond 'swiftly and decisively' to any further Russian aggression

President Joe Biden told Ukrainian President Volodymyr Zelensky in a roughly hour-long call Sunday that the US would respond "swiftly and decisively" if Russia takes further steps toward invasion, according to a White House readout of the call.

source https://www.cnn.com/2022/02/13/politics/biden-zelensky-call/index.html