U.N. Secretary General Ban Ki-moon is urging Iran to resume talks with Western nations that suspect it is working on a nuclear weapons program. Tehran insists that its atomic program is for peaceful purposes.

During a press briefing at the World Economic Forum in Davos, Switzerland, Mr.Ban said Iran has the responsibility to prove its case.

“I'm deeply concerned by the report of the most recent IAEA International Atomic Energy Agency report indicating that there is a possibility of a military dimension in Iranian Nuclear Development Program of which they say is peaceful. Onus is on the Iranian side. ”

The U.N. chief says the only way to address the crisis peacefully is through dialogue.

He added that Tehran must abide by the Security Council resolutions mandating that it proves the country's nuclear program is for peaceful purposes.