Aug 14 (Reuters) - The Russian rouble pulled away from a

one-week high on Thursday to weaken towards 80 to the dollar,

supported by hopes of positive U.S.-Russia talks this week but

held back by reduced government FX interventions and declining

export revenues.

Russian markets have been jittery since U.S. President

Donald Trump set an August 8 deadline for Russia to agree to

peace in Ukraine or face tightened sanctions. All eyes are now

on the August 15 meeting between Trump and Russian President

Vladimir Putin in Alaska.

"It is impossible to predict the outcome of this meeting,

which means the rouble rate in the coming days may experience

increased volatility," said Maxim Timoshenko of Russian Standard

Bank.

At 0930 GMT, the rouble was down 0.5% at 79.85 to the

dollar, according to data compiled by LSEG based on

over-the-counter quotes, and 0.3% weaker at 11.10 against

China's yuan, the most traded foreign currency in Russia.

Brent crude oil, a global benchmark for Russia's

main export, was up 0.4% at $65.87 a barrel.

Russia has lowered its net sales of foreign currency this

month, reducing support for the rouble.

Timoshenko cited deferred demand for imports, declining

export revenues and budget issues - Russia's January-July budget

deficit leapt to 2.2% of GDP, or 4.9 trillion roubles ($61.4

billion), - as other factors weighing on the rouble.

($1 = 79.8500 roubles)