In the months leading up to the Sochi Winter Olympics, three suicide bombings have rocked cities in Russia and the threat of terror attacks has hovered like a dark cloud over the impending Games.
Although Russian President Vladimir Putin has promised a "ring of steel" to secure the games, the United States has positioned two warships in the Black Sea as a means of protection against potential terrorist attacks.
The U.S. Navy says the USS Mount Whitney and the USS Ramage will be in the area to respond to any emergencies during the Olympics.
Equipped with machine guns, rockets and anti-ship missiles, the ships could transport supplies to around 3-thousand people in case of an emergency evacuation.
Also, the U.S. has warned airlines with direct flights to Russia to be aware of the possibility of explosives hidden in tubes of toothpaste or containers holding skin care products, as they could be used to store ingredients that could be assembled aboard.
Russia has banned passengers from carrying any liquids in carry-on luggage during the Games.
Meanwhile, Russian security forces have killed the suspected mastermind of recent suicide bombings on public transportation services in the southern city of Volgograd.
Russian state media reported Wednesday that Dzhamaldin Mirzayev was shot dead by security forces during a house siege in Russia's restive Dagestan region.
Connie Kim, Arirang News.