# President Joe Biden says he has made it clear to Ukraine’s president Volodymyr Zelensky, that the US will respond swiftly and decisively to any further Russian aggression against his country. The White House says the two leaders spoke on the phone for nearly an hour yesterday. Russia has denied any plans to invade Ukraine despite the build-up of some 100-thousand soldiers on Ukraine’s borders. Biden and Zelensky have agreed on the need to continue pursuing diplomacy and deterrence in response to Russia’s military build-up.