Under the 1972 ABM treaty the Soviet Union and the United States had agreed to deploy only one anti-ballistic missile system each. With that limit gone the U.S. started to build a global missile defense system in Alaska and California that was designed to defend against incoming Russian missiles. The Russian president warned about the illusion such a system would create:
"Starting from 2002, after the US unilateral withdrawal from the ABM Treaty, which is an absolute cornerstone of international security, the strategic balance of forces and stability, the creation of the US global missile defense system has been continued persistently," said the Russian president. According to him, this poses a threat not only to Russia's security, but also to the entire world — just because of the possible disruption of this strategic balance of forces.
"I think this is harmful for the United States as well, because it creates the dangerous illusion of invincibility," Putin said.