So long as they feel they are justified, they don't really need to explain it to others. That's how the CCP works. Speaking of the international community, it is interesting. The news has been going on how the US challenged the zone with their B-52s and all that. But go underneath the surface and you will see something a little different. The US has been actually been careful not to provoke the Chinese over the zone. This B-52 flight is actually just to assure the Japanese. Had the US really want to provoke the Chinese and stick it in their face, they would send a hell of alot more than just a pair of B-52s.
That means the US is less gung-ho than the Japanese. You can already see this when the US advice their carriers to report their flight plans to the Chinese, contradicting the Japanese. They may well be advising the Japanese behind-the-scenes to not let things get out of hand. The last thing the US wants is to be dragged into a Sino-Japanese conflict over some islands.