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LONDON NATO, the United States and Ukraine say Russian forces are taking a more significant role in fighting in eastern Ukraine, bolstering separatist groups that have lost considerable ground to the government forces in recent weeks.

The cultural center of rebel-held Donetsk became a casualty of the fighting when it was hit by artillery shells. Ukrainian troops are pressing their offensive in the east, even amid reports of Russian forces joining separatists to rout other Ukrainian forces farther south.

Ukrainian President Petro Poroshenko says Russian troops have entered his country and the security situation has deteriorated. He wants a meeting of the U.N. Security Council.

NATO and U.S. officials agree that unmarked military vehicles, seen just inside Russian territory, are crossing the border to provide equipment, ammunition and perhaps 1,000 fighters to help the separatists.

The prime minister of the self-proclaimed Donetsk Peoples Republic acknowledged the presence of as many as 4,000 Russians over the last several months, but said they are not regular military units. He claimed some of them are soldiers on vacation, but Ukrainian and Western officials say it is an organized invasion, designed not to look like one, similar to what Russia did in Crimea in February.