Japan was demilitarized post-WWII because of terms set by the US. Japan is largely defenseless against aggression by neighboring states like China and North Korea. North Korea is a major concern because if North Korea is going to attack anyone, it'd be Japan. It's the US's responsibility to defend Japan and potentially oversee and assist with the re-militarization of Japan.
The US should help japan because it's the right thing to do, and it's in our best interests to get japan on our side.
But is North Korea even a THREAT? Us Americans laugh at it. Countless memes caption "Meanwhile in North Korea" with a missile going haywire. The only threat to anyone considering North Korea would be the safety of its own citizens.
North Korea is politically and economically unstable. The North Korean regime takes great pride in being perceived to be a powerful threat. By my estimation this makes this country a threat. Japan, on the other hand, has a stable government and has been ally of the US for many years. This alliance is in the best interest of both the US and Japan. As others have pointed out, the US imposed restrictions on Japan's military following World War Two. The US needs to provide military support to this valuable ally. If North Korean threats are considered, missile defense systems make sense for this region,
North Korea has threatened the United States of America. If the same country threatens one of our allies, then we are obligated to help defend them against our common foe. It is in fact in our best interest to do battle with the enemy elsewhere than on our own soil.
Well, I think that U.S goverNment has to do everything they can in order to stop all the militaristic expansion that North Korea is trying to implement, first in Asia, and then in the whole world. Korean Prime minister is a sadistic dictator that must be stopped before he does any real harm.
After World War II, the US was instrumental in bringing down the fall of the Japanese Empire. Japan was forbidden to build a military force as part of the agreement and reparations after that war. Also, the Korean War was a NATO police action to keep North Korea from attacking its neighbors and spreading its Communist influence, and the US is also obligated to assist Japan as well as South Korea from any attacks. If the relationship is meant to change, then the US should revisit any and all restrictions and obligations with Japan and subsequently other Asian Nations.
First off, there is no way North Korea would do something like that.
Secondly, China is the one we should be watching, being that they keep poking Japan with a stick, and both sides are feuding over territorial disputes.
Keep in mind, it's easy to say "We need to protect them!" and not even think about who we are protecting. Are we even protecting the "good guys" or is it like the Cold War, when we backed horrible dictators just because they were Anti-Commie. Not that Japan is a horrible dictatorship, but we aren't exactly best buds with China at the moment, even though we should be trying to be.
Remember in WWII Japan considered the Chinese to be on the same level as Jews were to the Nazis. There is some bitter history between the two.
I don't think it is in the United States best interests to be defending Japan military against North Korea, any tensions or conflicts should be solved between those two countries peacefully if possible, I have a very hard time believing North Korea would ever seriously consider attacking another Nation with military force.