Iran says it is continuing to acquire uranium and is close to finishing a plant where it can build more centrifuges to enrich uranium.
The announcement on July 18 comes a day after Iran filed a lawsuit at the International Court of Justice (ICJ) against the United States in response to President Donald Trump's decision in May to pull his country out of the 2015 nuclear accord and reimpose sanctions on Tehran.
Supreme Leader Ayatollah Ali Khamenei and other hard-liners in Iran have questioned whether Iran should continue honoring its obligations under the landmark deal with world powers after Trump's decision.
Under the terms of the 2015 agreement -- which also was signed by Britain, France, Germany, Russia, China, and the European Union -- Tehran agreed to curb its nuclear program in exchange for relief from international sanctions.
The other signatories have said they will remain a part of the deal. Iran has demanded financial concessions from Europe to compensate for losses caused by Washington’s renewed sanctions.
Khamenei last month announced his country was preparing to increase uranium-enrichment capacity at its Natanz nuclear facility.
Vice President Ali Akbar Salehi, who heads the Iranian Atomic Energy Organization, said Iran will continue adhering to the nuclear deal and that the country's stepped-up nuclear activities will remain within the limits set by the accord.
A spokesman for the International Atomic Energy Agency (IAEA) told Reuters that the organization was aware of Iran’s announcement but had no comment.
Iran says its nuclear program is strictly for civilian purposes, while Washington has accused it of attempting to develop nuclear weapons.