WARSAW, July 4 (Reuters) - Poland has rejected a U.S. offer to boost its air defences in return for basing a "missile shield" on Polish soil but remains open for further talks with Washington, Prime Minister Donald Tusk said on Friday.

"We have not reached a satisfactory result on the issue of increasing the level of Polish security," Tusk told a news conference after studying the U.S. proposal. The details of the offer have not been made public.

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