MOSCOW, Jan 13 (Reuters) - The Russian rouble weakened

slightly against the U.S. dollar and China's yuan on Monday, as

rising oil prices offset the impact of a new U.S. sanctions

package targeting Russia's oil and gas revenue.

The rouble was down 0.9% at 102.50 against the dollar

by 0715 GMT, over-the-counter market data showed. The rouble

weakened 0.5% to 13.78 against the yuan in trading on the Moscow

Stock Exchange (MOEX).

The yuan has become the most traded foreign currency in

Russia, with China using the currency to pay for energy imports

from Russia.

The U.S. Treasury on Jan. 10 imposed sanctions on Russian

oil producers Gazprom Neft and Surgutneftegaz, as well as 183

vessels that have shipped Russian oil. Oil prices have since

risen above $81 a barrel, the highest in more than four months.

One-day rouble/dollar futures, which trade on MOEX and are a

guide for the over-the-counter exchange rate, were up 0.2% at

103.25. The Russian central bank set the official exchange rate

at 101.91.