President Trump is rattling the U.S.’s formidable nuclear saber amid his growing frustration with Russian President Vladimir Putin’s refusal to halt the war in Ukraine, just days ahead of Trump’s ...

The exchange takes place as Trump threatens new sanctions on Russia and buyers of its oil unless Moscow agrees to end the war ...

Russia’s former President Dmitry Medvedev on Monday accused NATO countries for the abandonment of the moratorium on the nuclear treaty.