Iran said on Saturday it had agreed to a roadmap with the U.N. nuclear watchdog to resolve all outstanding questions about the country's nuclear program by late June, a move seen as a latest push to revive Tehran's 2015 nuclear deal with global powers.

The announcement comes as all parties involved in indirect talks between Tehran and Washington aimed at reviving the nuclear pact have said they were close to reaching an agreement in Vienna.

"We have agreed to provide the IAEA by the end of (the Iranian month of) Khordad (June 21) with documents related to outstanding questions between Tehran and the agency," Iran's nuclear chief Mohammad Eslami told a joint news conference with International Atomic Energy Agency (IAEA) chief Rafael Grossi.