MOSCOW – An American diplomat said yesterday that envoys from the five permanent Security Council members plus Germany discussed sanctions against Iran over its nuclear program, but failed to reach agreement on how to proceed further.

Undersecretary of State Nicholas Burns told the Associated Press following nearly three hours of talks that diplomats recognized the “need for a stiff response to Iran’s flagrant violations of its international responsibilities.”

President Bush said “all options are on the table” to prevent Iran from developing atomic weapons but that he will continue to focus on diplomacy.

Mr. Burns, speaking in Moscow, said sanctions had been discussed during the meeting hosted by Russia but indicated that further talks would be needed.

“Iran’s actions last week have deepened concern in the international community and all of us agreed that the actions last week were fundamentally negative and a step backward,” he told AP. “So now the task for us is to agree on a way forward.”

He was referring to the announcement last week by Iran’s hard-line president, Mahmoud Ahmadinejad, that the country had successfully enriched uranium for the first time.

Mr. Burns gave no specifics as to the type or timing of sanctions and he refused to say whether Russia had softened its opposition to sanctions against Iran. But he reiterated that America expected action in the Security Council after an April 28 deadline for Iran to stop uranium enrichment.

Mr. Ahmadinejad remained defiant, warning yesterday that Iran will “cut off the hand of any aggressor” that threatens it and insisting that its military has to be equipped with the most modern technology.

“The land of Iran has created a powerful army that can powerfully defend the political borders,” he told a parade commemorating Iran’s Army Day.