The latest on the Ukraine-Russia border crisis: Live updates | CNN

What to know about escalating tensions between Russia and Ukraine

Boris Johnson has warned President Vladimir Putin that a Russian invasion of Ukraine would be a 'disastrous step'.

U.S., Russia clash during UN meeting

US government agencies accuse Russia of election interference

U.S. weighs options as tensions rise with Russia

Key Moments From Putin’s State-Of-The Nation Speech

Watch Putin's full speech from Helsinki joint press conference

Putin’s state of the nation speech: What exactly did he say?