By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks sagged Friday, with investors watching for any developments on a possible cease-fire agreement for eastern Ukraine, but the region's equity benchmark was on track for a fourth straight week of advances.

Ukrainian forces and pro-Russia separatists were fighting near the port city of Mariupol in southeastern Ukraine on Friday, according to news reports. The clashes took place as representatives from Ukraine, for pro-Russia rebels and other leaders were expected to meet in Minsk to discuss a plan to halt the fighting.

Meanwhile, U.S. and European leaders at a North Atlantic Treaty Organization summit in Wales discussed imposing toughen sanctions on Russia over the Ukraine crisis, and there were signs that some countries could decide to send weapons to Kiev.

Markets: As investors awaited any firm details about the peace talks or more sanctions, the Stoxx Europe 600 fell 0.6% to 346.81. Also on the horizon was an update on labor-market conditions in the U.S., the world's largest economy, with August jobs data due at 1:30 p.m. London time, or 8:30 a.m. Eastern.

Advancers on the benchmark included Julius Baer , up by 1.5% after the Zurich-based bank was upgraded to a buy rating from neutral at UBS, citing expected multiple expansion.

Decliners included metals producer Fresnillo and Coca-Cola HBC , down 3.9% and 3.8%.

The Stoxx Europe 600 was in line for a 1.4% weekly decline, coming largely from Thursday's jump of 1.1% after the European Central Bank announced further monetary policy easing in an effort to boost low inflation levels.

The euro (EURUSD) bought $1.2960, slighting recovering from $1.2949 recorded in New York late Thursday, when the weakness was triggered by the ECB's cut in interest rates and plans to buy asset-backed securities.

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