March 4 (Asia Today) -- U.S. experts say a military operation similar to the recent U.S.-Israeli strike that killed Iran's Supreme Leader Ayatollah Ali Khamenei would be far more difficult to carry out against North Korean leader Kim Jong Un. While the operation against Iran may create psychological pressure on Pyongyang, analysts say the strategic environment surrounding North Korea - including its nuclear weapons, support from China and Russia and the risk to U.S. allies in Northeast Asia -