It was the first time since taking office that Trump has said he wants to maintain the treaty's limits on strategic nuclear weapons deployments when it expires on February 5. "When you take off nuclear restrictions, that's a big problem," Trump said.

Retired Air Force Gen. Charles Wald joins 'Fox News Live' to weigh in on Russia's increased attacks on Ukraine despite President Donald Trump's ultimatum to Vladimir Putin.

The US does not rule out imposing secondary sanctions on Russia. Such restrictions could come sooner than 50 days, said US President Donald Trump during a conversation with journalists. Trump was asked whether he plans to introduce secondary sanctions against Russia.

The announcement appears to preclude any kind of top-level meeting or breakthrough ahead of the 50-day deadline for an agreement given by President Donald Trump.

Ukraine and Russia attacked targets on each other's territory on Thursday after brief direct talks between the two sides failed to make any progress on steps to end nearly three-and-a-half years of war.

The attacks came hours after brief direct talks failed to make any progress on steps to end nearly three-and-a-half years of war.

A passenger plane crashed Thursday in Russia's Far East, killing all 48 passengers and crew on board, officials said. The Angara Airlines flight disappeared from radar, and searchers later found the burning wreckage of the plane on a hillside south of its planned destination in Tynda,

The Angara Airlines passenger plane “disappeared from radar” before it was found near Tynda, in Russia’s far east, authorities said.