WASHINGTON — In their last report before the United Nations Security Council votes on sanctions against Iran, international nuclear inspectors declared that Iran has now produced a stockpile of nuclear fuel that experts say would be enough, with further enrichment, to make two nuclear weapons.

The report, by the International Atomic Energy Agency, a branch of the United Nations, appears likely to bolster the Obama administration’s case for a fourth round of economic sanctions against Iran and further diminish its interest in a deal, recently revived by Turkey and Brazil, in which Iran would send a portion of its nuclear stockpile out of the country.

When Iran tentatively agreed eight months ago to ship some of its nuclear material out of the country, the White House said the deal would temporarily deprive Iran of enough fuel to make even a single weapon.

But Iran delayed for months, and the figures contained in the inspectors’ report on Monday indicated that even if Iran now shipped the agreed-upon amount of nuclear material out of the country, it would retain enough for a single weapon, undercutting the American rationale for the deal.

The toughly worded report says that Iran has expanded work at one of its nuclear sites. It also describes, step by step, how inspectors have been denied access to a series of facilities, and how Iran has refused to answer inspectors’ questions on a variety of activities, including what the agency called the “possible existence” of “activities related to the development of a nuclear payload for a missiles.

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