Poland ? Poland will only sign up to accept a U.S. missile defense base if Washington gives significant help to modernizing Poland’s military, the Polish defense minister said in comments published Saturday.

“As long as we cannot sign an agreement about a satisfactory contribution by the Americans to the modernization of our armed forces, we can’t talk about our agreeing to an American installation on our territory,” Bogdan Klich was quoted as saying in an interview with the daily Polska.

Washington wants to place 10 missile defense interceptors in Poland and a radar system in neighboring Czech Republic as part of a global system it says is necessary to protect the U.S. and Europe against future attacks from Iran.

Polish Foreign Minister Radek Sikorski said in Washington three weeks ago that Poland and the U.S. had reached an agreement in principle after he received assurances that the U.S. would help Poland strengthen its short- to medium-range air defenses.

The two sides did not elaborate, and it remained unclear whether the United States had made specific promises to provide air defense systems. Polish officials have pressed for Patriot or THAAD missiles.