It is true that Russian soldiers came to Crimea, to ensure the safety of the referendum.

These were soldiers who occupied airports, military bases, and the parliament building of Crimea. They did it all unmarked. It was only afterwards that Putin publicly acknowledged that they were Russian forces all along.

As for Donbass, Russia can easily obliterate all Ukrainian units in the region using artillery and air strikes, no need to move a single soldier over the border.

They might, but all-out war has drawbacks for Russia. Right now, Russia seeks to divide the West to weaken any response. I’m not blaming it for doing that because it’s smart tactics, but it’s hard to deny when you watch closely. The more they overt they are, the more united the West is against it. The West has many more levers it could pull. If Russian oligarchs start getting their investments in Western countries frozen, words will be had with Putin. That’s why I kind of doubt Russia will follow through with a full scale invasion.

What I find curious is that you dont have any problem at all with NATO troops going to Ukraine, and teaching their military how to fight Russia. Is that what you call peaceful behaviour?

It’s not peaceful behavior, but these are not peaceful times in Ukraine. Areas of Ukraine are active war zones.