Iranian Foreign Ministry's spokesman Ramin Mehmanparast on Monday called on world powers to avoid policy of pressure in the upcoming Baghdad nuclear talks, the semi- official Fars news agency reported.

Mehmanparast cautioned the world powers that the policy of pressure against Iran will not yield their desirable results in the next round of talks, said Fars.

The last round of nuclear talks between Iran and the UN Security Council's five permanent members -- the United States, Britain, France, Russia and China -- plus Germany (P5+1) concluded in Turkey's Istanbul in April, with all sides describing the talks as positive and agreeing to meet again in the Iraqi capital on May 23.

"If the P5+1 enter the talks with the goal of cooperation in a positive atmosphere, we (Iran) will welcome it, too," the spokesman told Fars.

Such an attitude would be for the interests of both sides, he was quoted as saying.

He added that the Istanbul talks were held in a positive atmosphere and the two sides accepted to focus on the Nuclear Nonproliferation Treaty as an axis and a principle for dialogue.