Even if it was Ukrainian... letting Russians invade from Belarus in February and let them shoot missiles from their territory makes them a war participant already. An perhaps astray anti air missile that did not cause any casualties is just a piss poor excuse for Belarus to escalate.

> air defense can be used offensively

Why? First things first: the air defence needs to keep all of Ukraine safe from cruise missiles and drone attacks. Additionally to keeping military targets safe, their more normal role.

It's a big country, this would be a big achievement.