WASHINGTON - The United States said Wednesday it is concerned about Russia's announcement that it would increase peacekeeping forces in conflict zones. "We're concerned about reports from the region. The president has been updated on the latest on the situation," U.S. National Security Council spokesman Gordon Johndroe said in a statement. The former Soviet republic of Georgia has warned Russia not to increase its peacekeeping forces in the conflict zones, otherwise it would view the move as an aggression. Russia's Defence Ministry said Tuesday that "due to the heightening of tensions in the zone of the Georgian-Abkhazian conflict, the Russian peacekeepers' command put up 15 additional observation posts." Russian peacekeeping forces have been deployed in the Georgian breakaway regions of Abkhazia and South Ossetia since the early 1990s.