The UN nuclear watchdog confirmed Wednesday that Iran is implementing "nuclear-related commitments" under its deal with world powers.

Yukiya Amano, director-general of the International Atomic Energy Agency (IAEA) reiterated in a statement that "Iran is subject to the world's most robust nuclear verification regime" and that the 2015 accord was "a significant verification gain".

US President Donald Trump announced the US's withdrawal from the deal on Tuesday.