LOS ANGELES, June 4 (Xinhua) -- U.S. President Donald Trump said he discussed the Iranian nuclear issue with Russian President Vladimir Putin via a phone call on Wednesday and urged Iran to make decision "pertaining to nuclear weapons" quickly.

Recounting the 75-minute call with Putin, Trump said in a post on his Truth Social account the two leaders "discussed Iran, and the fact that time is running out on Iran's decision pertaining to nuclear weapons, which must be made quickly!"

"I stated to President Putin that Iran cannot have a nuclear weapon and, on this, I believe that we were in agreement," Trump wrote, adding that "it is my opinion that Iran has been slowwalking their decision on this very important matter, and we will need a definitive answer in a very short period of time!"

He also revealed that Putin suggested getting involved and pushing the discussion between Washington and Tehran to go ahead.

"President Putin suggested that he will participate in the discussions with Iran and that he could, perhaps, be helpful in getting this brought to a rapid conclusion," Trump said.

Starting in April, Iran and the United States have held five rounds of indirect talks, three in the Omani capital Muscat and two in Rome. The United States insisted during the negotiation that Iran must completely cease uranium enrichment, however, the demand was firmly rejected by Tehran.

Iran's Supreme Leader Ali Khamenei on Wednesday rejected the U.S. proposal for a nuclear deal that would prohibit any uranium enrichment, emphasizing that uranium enrichment is a "key" component of Tehran's nuclear program. ■