Collective Self-Defense

Japan's PM Abe and the Cabinet members announced that Japan has the right to collective self-defense and will use military power under the right in some severe cases, despite Japanese constitution doesn't mention the right on it.

I believe we have to change our constitution first, but the real situations don't allow to wait its changing. In fact, some of our territory was already conquered by neighboring country. I think every nation has the right to collective self-defense, so it's time to admit we have and use the right.