Feb 18 (Reuters) - The Russian rouble weakened against

the dollar on Tuesday as Russian and U.S. officials met in Saudi

Arabia for the most significant talks to date between the two

former Cold War foes on ending Moscow's war in Ukraine.

At 0807 GMT, the rouble was down 0.8% at 90.33 against the

dollar on the Moscow Exchange, though still close to a

five-month high reached last week.

It was also down 0.6% against China's yuan, the most traded

foreign currency in Russia.

The Russian currency has gained about 20% against the dollar

this year, mostly on expectations of easing geopolitical

tensions between Russia and the West.