Security Council of Russia session in Moscow. `According to estimates by experts, the Arctic shelf may have about one-fourth of the world`s shelf hydrocarbon reserves, and the use of these reserves is a guarantee of Russia`s overall energy security,` Russian President Dmitry Medvedev said at a Russian Security Council session. Pictured: (r-l)prime-minister Vladimir Putin, head of Security Council Nikolai Patrushev, Foreign Minister Sergei Lavrov attend the session