TEHRAN (Reuters) - Iran threatened on Monday to use its "full might" to endanger U.S. interests if Washington upped the pressure on Tehran over its disputed nuclear program. Washington and the European Union have prepared the ground for the governing board of the International Atomic Energy Agency (IAEA) to send Iran to the U.N. Security Council next month for possible sanctions for violating international nuclear obligations. The United States and its European allies argue Iran is making atomic fuel for use in weapons, but Tehran says its nuclear program is dedicated solely to generating electricity. Ali Larijani, secretary-general of Supreme...