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找不到好的英语六级听力练习材料?绝对是你的不二选择。大家平时多用英语磨耳朵，时间长了英语六级听力绝对会有很大的提高。 英语六级听力练习：标准4.4 点击收听 WASHINGTONNATO ministers this week reaffirmed their committment to collective defense following Russias annexation of Ukraines Crimean peninsula. NATO Secretary General Anders Fogh Rasmussen used strong language to describe Russias military incursion into Ukraine and its annexation of Crimea. Russias aggression against Ukraine is the gravest threat to European security in a generation. That view is shared by Charles Kupchan, a NATO expert at Georgetown University. There have been other competitors for that honor, including the Russian invasion of Georgia in 2008, said Kupchan. But I think this represents the most serious development in that Mr. [Vladimir] Putin has broken the rules. He has done so in a way that threatens a rules-based international system. Kupchan said for the first time since the collapse of the Berlin Wall NATO is thinking about increasing its ability to defend the territorial integrity of its member states. Weve seen F-15s, F-16s [jet fighters] and AWACS [surveillance planes] deployed in central Europe, he said. And so in that respect, we are witnessing what could be the return of militarized rivalry between Russia and the West. We are not there yet, but if Putin doesnt hold off, we will be headed in that direction. | 
