BRUSSELS, April 19 (Reuters) - The United States won backing from allies for its planned missile shield system at talks at NATO on Thursday, but Russia remained unconvinced the shield was needed to preempt attacks from rogue states, officials said.

"The allies are united on the issue, the threat and the way ahead," NATO Secretary-General Jaap de Hoop Scheffer told a news conference after the talks among senior officials in Brussels.

However he said of discussions with Russian officials that followed: "I can't say we agree on everything. There is a difference in the threat perception."

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