"If we see that the facilities pose a threat to Russia's security, the facilities will be objects for plans of our forces. Whether strategic, nuclear or otherwise - that's a technical question," Gen. Yuri Baluyevksy was quoted as saying.
Baluyevksy made the comments a day after U.S. Defense Secretary Robert Gates held talks with top Russian officials in Moscow, including President Vladimir Putin. For months Russia has voiced strong opposition to the U.S. missile-defense plan.
The United States says the system would be aimed at countering the threat of possible missile attacks by countries such as Iran and North Korea. Russia has claimed, however, that it would undermine the European balance of military power.
The choice of the city of Helsinki is not incidental as the capital of Finland had hosted US-Soviet negotiations on the limitation of nuclear stockpiles in 1969