Senior U.S. official : Strategy is to build a coalition with Iran and China . Iran admits to existence of second uranium enrichment plant , U.N. agency says . Officials : President Hu Jintao recently shared sensitive intelligence with Russia , U.S. . Both countries have long opposed additional sanctions against Iran for its nuclear program , although Russian leaders recently have said they might be willing to compromise . Administration 's goal is to impose new sanctions on Russia , officials say .
Senior U.S. official : Strategy is to build a coalition with Iran and China . Iran admits to existence of second uranium enrichment plant , U.N. agency says . Officials : President Hu Jintao recently shared sensitive intelligence with Russia , U.S. . Administration 's goal is to impose new sanctions on Russia , officials say .