Earlier quoted context omitted.
This is false. The Syrian government invited Russian assistance against the combined invading forces of US/Israel/Turkey/ISIS. Accepting an official invitation is by definition not an "invasion". Heck, Assad was in Moscow just days ago! You are out of your depth here.
I used the terminology "intervention", and not "invasion", for a reason. If you're going to quibble, the US never sent any forces to Libya. France and the UK provided aerial support to a no-fly zone imposed by a UN resolution, with the US providing some naval support as well. So why does that qualify as an "invasion"? (Actually, if you really want to quibble, Russia has invaded Ukraine twice in the past decade--the R…
Which is more plausible when the target of your invasion shares a land border with you.