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Iran has delivered letters to ambassadors outlining its partial withdrawal from the 2015 nuclear deal with world powers, state television reported, without elaborating on what steps it plans to take.

The letters have been delivered to the leaders of Britain, China, the European Union, France and Germany, Al Jazeera reports. 

All were signatories to the nuclear deal, under which Iran limited its enrichment of uranium in exchange for the lifting of economic sanctions. A letter was also sent to Russia.

The country's foreign ministry said: "The decision of the high security council to 'stop acting on some of the Islamic Republic of Iran's commitments under the JCPOA [nuclear deal]' was communicated to the heads of state of the countries" still party to the deal.

The move came a year to the date United States President Donald Trump withdrew his country from the accord. Since then the US has restored crippling economic sanctions on Iran, even as Tehran continued to abide by the accord, according to UN inspectors.

Also on Wednesday, Iran's President Hassan Rouhani noted Tehran will keep excess enriched uranium, instead of selling it as called for by the nuclear deal.

Iranian officials had warned that the country might increase its uranium enrichment, potentially pulling away from the deal after spending a year trying to salvage it with European partners.