In a sane universe. You could rephrase ALL invasions as "defense of another". For example, Putin's excuse to invade Ukraine was 'to "protect the people" of the

In a sane universe. You could rephrase ALL invasions as "defense of another". For example, Putin's excuse to invade Ukraine was 'to "protect the people" of the Russian-controlled breakaway republics.' Otherwise you're just arguing that countries can point at some random object and say "that's under my watch" and bring armies to fight for that thing. In a sane universe that's called an invasion. Whether the invasion is morally justified or not is another matter.