MOSCOW, Dec. 9 (Xinhua) -- Russia said Thursday the deployment² of a U.S. Air Force unit on a Polish air base will harm security of other countries.

"It looks like the old NATO reflex（反射） of building up force in detriment³（损害，伤害） of other countries' security," said the Foreign Ministry⁴ in a statement.

U.S. President Barack Obama agreed with his Polish counterpart Bronislaw Komorowski Wednesday in Washington to enhance bilateral⁵（双边的） defense⁶ ties in the spirit of the 2008 U.S.-Polish Declaration on Strategic Cooperation.

The declaration includes increased cooperation between air forces of the two countries with the aim of strengthening interoperability（互操作性） as NATO allies through regular joint⁷ training exercises, and the establishment of a U.S. air detachment in Poland to support periodic rotation⁸ of U.S. military aircraft.

The statement from the Russian Foreign Ministry also mentioned the U.S. Patriot⁹ air defense systems deployed¹⁰ in Poland in 2009, saying the "real designation（指定） of which is also highly questionable¹¹. "

"All of this looks all the more so strange, since the Russia- NATO Council has had an encouraging summit and NATO has made declarations that it does not view Russia as an enemy," it said, referring to the usually dubbed¹²（被称为） "historic" Lisbon summit between Moscow and Brussels.

Russia will "take notice of the U.S.-Polish plans in the process of implementing¹³（实施，执行） our own programs for the construction of armed forces and in the process of working with our allies," the ministry said.

The Kremlin has long been opposing U.S. plans to deploy¹ missile defense units in Eastern Europe, accusing（指责，非难） Washington of targeting Russia.