Which tyrant is Japan threatened by? (except Uncle Sam of course

)
S.Korea is threatened? The North's army will run out of gas 5 minutes into their offensive. And as soon as the army crosses into S.Korea, they'll all surrender and ask for some ******* food!
Japan is a vital ally and critical to the US. The US made a commitment to Japan after WWII, to rebuilt it and protect it, provided it does not create an offensive military. Japan and South Korea are threatened by N. Koreaon a regular basis today, and in some cases China. In the past the USSR was also a serious threat to both these countries. That is why the US still maintains a healthy troop presence in S Korea along the demilitarized zone, as well as in Japan. There are also other places / allies of US National Security interest around the world that the US has declared it is ready to go to war over if threatened: Israel, the Straits of Hormuz (main oil artery), Panam Canal, any of our closer European NATO allies such as UK, Germany, France, Italy, etc.
Arabs / Muslims on the other hand allied themselves with the Nazis during WWII, and then became client states of the Soviets (some still are). This prompted the US the start supporting Israel miltarily in the 60's as a counterbalance to Russian military influence in the region. Until then the US did not provide any military assistance or hardware to Israel. By then Israel had already won four of it's major wars against Arabs.