Iranian Supreme Leader Ayatollah Ali Khamenei seems to be in good health, after being released from hospital on Monday, following successful prostate surgery.Khamenei is fully regaining his health, Iranian media reported after his release. Moments after he left the hospital, the Iranian leader spoke to state media and weighed in on the latest issues that grabbed headlines while he was off the radar. He first took on the United States – which is currently trying to drum up support for a global coalition to tackle Islamic State militants.He called the US's bid to form a military campaign "biased" and "hollow" adding that there was mounting evidence to back that.While Iran supports Iraq's plight against the militant group tearing through the country, and seizing chunks of territory for its self-proclaimed caliphate, Tehran said it would not back the US' "contradictory" policies.In an official statement posted to his website on Monday, Khamenei said Iran rejected the US offer to tackle Islamic State – presented to them via their ambassador in Iraq – due to the Americans' "dirty hands." The supreme leader's version of events that Iranian Foreign Minister Mohammad Javad Zarif rejected US Secretary of State’s request to cooperate against ISIS come in stark contrast to US Secretary of State John Kerry comments. Last week, the top US diplomat ruled out the option of cooperating with the Islamic Republic, saying it would be inappropriate for Iran to be involved in the efforts.