Without the USA supporting do you really feel they would ever have a chance of getting the shield? I think we both know the answer.
Good news is that Tusk stuck to plans.
At a press conference after a meeting with the Russian President, Tusk said that Vladimir Putin is not an “enthusiast” of the deployment of the American anti-missile shield in Poland, but respects Poland’s freedom to decide about its own safety. The Polish PM ensured him that the shield would not be directed against Russia.
http://www.polskieradio.pl/thenews/foreign-affairs/?id=75480