The United States has entered into an agreement with Poland that will place a U. S. Missile Defense System in Poland and ensure that the United States will come to immediate help of Poland in the event they are ever attacked by Russia. Russia has reacted angrily to the move clearly designed to send a strong message to them to halt any intentions they have for futher aggression against former Soviet states:

The United States and Poland reached a long-stalled deal on Thursday to place an American missile defense base on Polish territory, in the strongest reaction so far to Russia's military operation in Georgia.

Russia reacted angrily, saying that the move would worsen relations with the United States that have already been strained severely in the week since Russian troops entered separatist enclaves in Georgia, a close American ally.

But the deal reflected growing alarm in countries like Poland, once a conquered Soviet client state, about a newly rich and powerful Russia's intentions in its former cold war sphere of power. In fact, negotiations dragged on for 18 months — but were completed only as old memories and new fears surfaced in recent days.

Those fears were codified to some degree in what Polish and American officials characterized as unusual aspects of the final deal: that at least temporarily American soldiers would staff air defense sites in Poland oriented toward Russia, and that the United States would be obliged to defend Poland in case of an attack with greater speed than required under NATO, of which Poland is a member.

Polish officials said the agreement would strengthen the mutual commitment of the United States to defend Poland, and vice versa. "Poland and the Poles do not want to be in alliances in which assistance comes at some point later — it is no good when assistance comes to dead people," the Polish prime minister, Donald Tusk, said on Polish television. "Poland wants to be in alliances where assistance comes in the very first hours of — knock on wood — any possible conflict."

A sense of deepened suspicions — and the more darkly drawn lines between countries in the region — were also apparent in the emotional reaction from Russia.

"It is this kind of agreement, not the split between Russia and United States over the problem of South Ossetia, that may have a greater impact on the growth in tensions in Russian-American relations," Konstantin Kosachyov, chairman of the foreign affairs committee in the Russian Parliament, told the Interfax news agency on Thursday in Moscow.

South Ossetia is the pro-Russian enclave inside Georgia where Russia sent troops last week, following a military crackdown by the pro-Western government in Georgia.

The missile defense deal was announced by Polish officials and confirmed by the White House. Under it, Poland would host an American base with 10 interceptors designed to shoot down a limited number of ballistic missiles, in theory launched by a future adversary such as Iran. A tracking radar system would be based in the Czech Republic. The system is expected to be in place by 2012.