Russia says its response to the further development of a U.S. missile shield in Poland will go beyond diplomacy.

Russia's Foreign Ministry issued a statement saying the U.S. missile shield plans are clearly aimed at weakening Russia.

The U.S. says the missile defense system is aimed at protecting the U.S. and Europe from future attacks from states like Iran.

The United States and Poland signed a deal Wednesday to place a U.S. missile defense base just 115 miles from Russia's westernmost fringe.

Russia warns of response to US missile shield