From the AP:
Poland and the United States reached an agreement Thursday that will see a battery of American missiles established inside Poland, the prime minister said, announcing a plan that has infuriated Russia and raised the specter of an escalation of tension with the region's communist-era master. The deal, which Polish Prime Minister Donald Tusk said was to be signed later Thursday in Warsaw by Poland and the United States, includes what he called a "mutual commitment" between the two nations - beyond that of NATO - to come to each other's assistance in case of danger.