Iran will adopt an uncompromising stance when it resumes nuclear talks with major powers, betting it has the leverage to win wide sanctions relief in return for curbs on its increasingly advanced atomic technology, officials and analysts say.

The stakes are high, since failure in the negotiations resuming in Vienna on Nov. 29 to revive a 2015 nuclear deal would carry the risk of a fresh regional war.

Israel — Iran's arch foe —has pushed for a tough policy if diplomacy fails to rein in Iran's nuclear work, long seen by the West as a cover for developing atomic bombs.