Poland says recent U.S. proposals to strengthen the Polish military in return for hosting a missile defense system fall short of its demands.

Polish Prime Minister Donald Tusk told reporters in Warsaw Tuesday that the U.S. proposals have not reached a level that is satisfactory to Poland.

U.S. and Polish negotiators discussed the initiative last week.

The United States wants to install 10 land-based interceptor missile silos in Poland and associated radar bases in the Czech Republic.

Washington says the anti-missile system is intended to defend the United States and NATO allies against potential ballistic missile attacks by what it calls "rogue states," notably Iran.

Russia has blasted the U.S. plan as a threat to Russian security.

Some information for this report was provided by AFP and Reuters.