Russia warned the United States on Tuesday against basing elements of a planned missile defense system in Poland, saying this would undermine strategic stability and require a "corresponding" response from Moscow, Interfax news agency said. "This could have a negative impact on strategic stability, regional security and the relations between states," Interfax quoted ministry spokesman Mikhail Kamynin as saying in an interview. "Such a new situation objectively requires corresponding measures from us," Kamynin said.He did not specify what those measures would be. Russia, however, announced earlier this year that it was supplying Belarus -- an ex-Soviet republic wedged between Russia and Poland -- with its sophisticated S-300 anti-aircraft defense system.
The United States has for years been planning and testing elements of a new global anti-missile defense system that would combine space-based elements capable of detecting hostile missile launches with ground-based rockets that would track and destroy those missiles.