BUENOS AIRES, Argentina (AP) — President Donald Trump abruptly canceled a planned meeting with Russian President Vladimir Putin as he headed to the Group of 20 Nations summit Thursday, citing Russia's seizure of Ukrainian vessels as a source of tension in a relationship he has fostered in the face of criticism.

Trump tweeted his decision from Air Force One shortly after his former lawyer, Michael Cohen, revealed he had lied to Congress to cover up that he was negotiating a real estate deal in Moscow on Trump's behalf during the Republican presidential primary in 2016.

The news ensured any meet...