Iran says it will continue co-operating with the International Atomic Energy Agency after it adopted a resolution on Wednesday censuring Tehran's undeclared nuclear activities in the past.
The secretary of Iran's Supreme National Security Council, Hassan Rohani, who has been put in charge of the country's nuclear file, told a news conference in Tehran that Iran would soon be signing a protocol allowing tougher inspections.
Iran says its nuclear programme is designed to meet energy needs
He said it would continue to show complete transparency in its future nuclear programmes.
Mr Rohani left no doubt that Iran was pleased with the IAEA board of governors' resolution - despite its tough language and its warning that any further failures on Iran's part would not be tolerated.
He said that most of Iran's wishes had been achieved by the resolution, while the Americans had failed to accomplish their objectives.
Iran, he said, would continue full and transparent co-operation with the agency and would shortly be signing the additional protocol covering tougher inspections.
Tehran had no worries about the future, Mr Rohani said, because its nuclear activities were completely peaceful, so it had nothing to hide.
It would also continue implementing the agreement it reached with the foreign ministers of three major European countries - France, Britain and Germany.
The three helped defuse the crisis over Iran's nuclear activities by promising future co-operation in advance technology, provided Iran satisfied the IAEA.
Mr Rohani praised the Europeans for their initiative and their openness to dialogue - in contrast, he said, to the Americans, whose policies of threats and pressures had been defeated.
Given the successful European example, Mr Rohani said, Washington might now realise it was wrong and review its positions.
Twice in the past year, the Americans had been caught lying, he said - first over Iraq's alleged nuclear weapons and then over Iran's.
President Bush, he said, did not even dare to walk openly through the streets of London - far less those of Baghdad.
In October, Iran decided to co-operate fully with the IAEA in order to end the nuclear issue as a source of external pressure on the regime.
The agency still has several months' worth of work to do to verify that Iran has been telling the full truth.
Tehran will remain on probation during that process and beyond.
But unless there are new revelations of serious secret activities, Iran may well have succeeded in its goal of laying the nuclear crisis to rest.