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Launching a rocket on another State's airspace is a right? That will violate the territorial integrity of Japan and the Philippines and threaten their national security. North Korea is shooting a rocket above Japan's airspace, it is just right for Japan to intercept it since it flies above their territory.
North Korea cannot be trusted, their military is powerful but their people suffer in starvation and brainwashed by the ruling party. It is communism gone wrong. And for a fact, NK is a totalitarian state that allows its people to starve to death while its ruling party is bathed in riches from corruption.
China's pressure on North Korea is a joke. It is China's indirect way of telling the Philippines to 'back-off' from South China Sea. It is also a matter of diplomatic leveraging on the part of China. They can use their ally NK to threaten US allies (Philippines, Japan, South Korea and Thailand) which resulted in these countries going back to the Allied fold. US' containment of China will cause another Cold War years from now.