MOSCOW, July 14 (Reuters) - The Russian rouble reversed

losses against the dollar and rose against China's yuan after

U.S. President Donald Trump warned he would impose "very severe

tariffs" on Russia if no deal on a peaceful settlement is made

in 50 days.

As of 1605 GMT, the rouble was 0.2% weaker at 78.10

per U.S. dollar after hitting 78.75 during the day, according to

LSEG data based on over-the-counter quotes. The rouble is up

about 45% against the dollar since the start of the year.

Trump announced new weapons for Ukraine on Monday and

threatened to hit buyers of Russian exports with sanctions,

expressing frustration with Russian President Vladimir Putin due

to the lack of progress in ending the war in Ukraine.

"Trump performed below market expectations," said analyst

Artyom Nikolayev from Invest Era. "He gave 50 days during which

the Russian leadership can come up with something and extend the

negotiation track. Moreover, Trump likes to postpone and extend

such deadlines."

Against the Chinese yuan, the most traded foreign currency

in Russia, the rouble strengthened 0.8% to 10.87 after weakening

by over 1% on Friday.

The Russian stock market rose 2.7% after Trump's

statement, according to the Moscow Stock Exchange.