WASHINGTON ( CNN ) -- President Obama recently shared sensitive intelligence with Russia and China about Iran 's newly unveiled nuclear facility to get the two countries ' leaders on board with new sanctions against Tehran , senior U.S. officials revealed Friday . President Obama speaks with Chinese President Hu Jintao , left , at the Group of 20 plenary session Friday . And the strategy to build a coalition with Russia and China `` has already begun to bear fruit , '' one senior U.S. official said . The officials declined to be identified because of the sensitive nature of the negotiations . Like the United States , Russia and China are both veto-wielding members of the U.N. Security Council . 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 . Watch Obama discuss the recent news » . Iran admitted to the existence of a second uranium enrichment plant in a letter sent to the International Atomic Energy Agency on Monday , the IAEA said Friday . The announcement prompted Obama , British Prime Minister Gordon Brown and French President Nicolas Sarkozy -- all in Pittsburgh , Pennsylvania , for the Group of 20 economic summit -- to hold a news conference in which they threatened a stiff response if Iran fails to conform to international obligations regarding nuclear development . `` Iran is breaking rules that all nations must follow , '' Obama said . He called on the Iranian government to `` take concrete steps '' to demonstrate it will comply with its international guidelines to ensure its nuclear program is for civilian use and not a covert weapons program .
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 .