A senior US official said on Thursday Russia and China had been blocking tough UN sanctions against Iran for months but there would be a push to impose them if Tehran had not suspended nuclear activity within two weeks.

Nicholas Burns, US Undersecretary of State for Political Affairs, was speaking before talks with the UN nuclear watchdog chief to check whether Iran was honoring an August deal to clarify past secret aspects of its nuclear programme.

The five permanent powers on the UN Security Council plus Germany will meet in London on Friday to weigh broader sanctions amid increased saber-rattling between Iran and Washington stirring fears of war if diplomatic pressure fails.

Iran has defied three Council resolutions, two with modest sanctions attached, demanding it stop enriching uranium. Iran says it wants nuclear-generated electricity, while Western powers suspect its program is a disguised bid for atom bombs.

Burns said Iran had been given a grace period since the last resolution on March 24 to allow for talks conducted by the EU’s foreign policy chief to bear fruit, but Iran had stuck to a refusal to suspend.

“Russia and China have been effectively blocking a third resolution since then,” he told reporters. Moscow and Beijing, two of the five veto-holders on the Council and major trade partners of Iran, have insisted on more time for diplomacy.

To preserve shaky unity, Western powers agreed in September to put off seeking harsher sanctions pending results of Iran’s transparency pledge to the International Atomic Energy Agency (IAEA), which will issue a report in mid-November.

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