The administration has sought to display a united front with its partners in the talks -- Britain, France, Germany, Russia and China. But Russia and China are especially wary of imposing more sanctions beyond those contained in three U.N. Security Council resolutions aiming at deterring Iran. Russian officials on Monday began backing off from statements made last week by President Dmitry Medvedev suggesting that Russian resistance to sanctions was weakening.
Foreign Minister Sergei Lavrov told Russian news agencies that the missile launches were "worrisome" but added, "I am convinced restraint is needed." Similarly, a Foreign Ministry source told Russian news agencies that Western powers needed to restrain themselves.
Both Russia and China have veto power on the U.N. Security Council, and reluctance by either to support additional sanctions would make it extremely difficult and time-consuming to erect additional international measures.