PRAGUE, June 5 (Reuters) - A U.S. plan to build part of its missile defence shield in the Czech Republic and Poland is a "purely defensive" measure not aimed at Russia, U.S. President George W. Bush said on Tuesday.

"My attitude on missile defence is that this is a purely defensive measure, not aimed at Russia," Bush told a news conference.

"My message (to Russian President Vladimir Putin) will be ... you should not fear the missile defence system, why don't you cooperate on the missile defence system? Why don't you participate with the United States? Send your generals over to see how such a system would work, send your scientists."

Russia is furious over U.S. plans to put 10 missile interceptors in Poland and a radar system in the Czech Republic. It views the missile shield plan as a threat to its national security.

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