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Germany's reliance on Russian natural gas poses a threat to European sovereignty, Polish Prime Minister Donald Tusk warned Monday amid rising East-West tensions over Ukraine. "Germany's reliance on Russian gas can effectively limit European sovereignty. I have no doubt," Tusk told reporters, days ahead of a Warsaw visit by German Chancellor Angela Merkel. The top European economy buys around one third of its oil and gas from Russia and has extensive trade and investment links with the vast country to the east.