President Vladimir Putin's spy chief warned the West on Wednesday that it risked disastrous consequences if the United States ...

LONDON -- The U.S. Embassy in Kyiv temporarily closed its doors on Wednesday out of "an abundance of caution," as it warned ...

President Vladimir Putin on Tuesday formally lowered the threshold for Russia’s use of its nuclear weapons, a move that ...

The U.S. Embassy in Kyiv says it will shut its doors after receiving warning of a potentially significant air attack ...

The threat to the Ukrainian capital follows news Tuesday that Ukraine carried out its first strike on Russian territory with ...

"The right arises to launch a retaliatory strike with weapons of mass destruction," Dmitry Medvedev said on Tuesday.

The new doctrine allows for a potential nuclear response by Moscow even to a conventional attack on Russia by any nation that ...

The move comes one day after Moscow said U.S.-made longer range missiles had been used in a Ukrainian attack that struck a ...

Putin lowered the bar for a nuclear attack after the US lifted a ban on Ukraine using long-range missiles. Ukraine carried ...

The 4-year-old document is known as Russia nuclear doctrine and President Vladimir Putin has signed a revamped version lowers ...

The U.S. Embassy in Kyiv said it would stay closed Wednesday after receiving a warning of a potentially significant Russian ...