

There ought to be rules of engagement
There are: When you positively identify an enemy soldier that has not surrendered and is combat capable, you are allowed to engage them. That’s what this soldier did.
There is no law stating that you need to make your presence and intent known before engaging the enemy.
Exactly this. I think the rest of us need to be less afraid and start shooting russians that violate our borders instead of asking them nicely to leave.
Same goes for ships cutting cables. I would enjoy seeing one of those ships being promptly sunk. No questions asked. Essentially telling russia “We know what you’re doing, and we’re done fucking around”.