“The United States and its key European allies clashed with Iran and Russia over Tehran’s expanding nuclear program, with the U.S. vowing “to use all means necessary to prevent a nuclear-armed Iran” in a U.N. Security Council meeting on Monday. The U.S., France, Britain and Germany accused Iran of escalating its nuclear activities far beyond limits it agreed to in a 2015 deal aimed at preventing Tehran from developing nuclear weapons, and of failing to cooperate with the U.N. nuclear watchdog, the International Atomic Energy Agency. Iran and Russia accused the U.S. and its allies of continuing to apply economic sanctions that were supposed to be lifted under the deal, and insisted that Tehran’s nuclear program remains under constant oversight by the IAEA.”