Brussels: NATO Secretary General Jens Stoltenberg on Tuesday welcomed the landmark nuclear agreement reached between Iran and the world powers.

Commending all parties for their perseverance, he said in a statement: "This agreement represents a historic breakthrough which, once fully implemented, will strengthen international security."

Stoltenberg said it was critical for Iran to implement the provisions of the agreement and to fulfill all its international obligations and advance security in the region and beyond.

The agreement was clinched between Iran and the P5+1 group – Britain, China, France, Russia and the US plus Germany – after more than two weeks of tough bargaining in Vienna. (IANS)