“An act of invading; especially: incursion of an army for conquest or plunder,” says Merriam-Webster.
Why is it so hard to recognize that moving Russian tanks and troops into Ukraine is an invasion?
Because we “need” Russia’s good offices sealing with bad guys like Iran and Syria? What good offices? Russia is their ally. Russia protects them.
Russia, specifically Vladimir Putin, is a bad guy , too.
Our denial of reality enables evil, too.