Tehran, March 21 -- Iran's Supreme Leader Ali Khamenei warned here on Friday that the United States and its allies will receive a "hard slap" if they use threats when dealing with Iran.

"The Americans should know that, when dealing with Iran, they will get nowhere with threats. They and the others should know that if they take any malicious action against the Iranian nation, they will receive a hard slap," Khamenei said during a meeting with people from different walks of life in the country.

The U.S. and European allegation that resistance groups in the West Asia region are Iran's proxies was a "big mistake and an insult to these groups," he said, noting that Iran does not need any proxy.

He called for opposing and resisting Israel's...