One instance of slant.

[Igel]

Russia assumes that anything that happens in Ukraine is Kiev's fault.

Hence their response to MH17. It happened in Ukraine, ultimately since Kiev is bothering to fight, it's responsible. If it just let the rebels secede, and then get other regions to secede, there'd be no problem.

That's the attitude towards any shelling of Russia territory from Ukraine. Even when there are squads holding a border point and their only weapons are mortars, Russia reports artillery shells falling on their side. The rebels may shell the border point and beyond, into Russia, but it's "artillery fire from Ukraine"--which is immediately understood to mean "artillery fire by Ukrainian sources."

Now, if you're wedged between rebels and the border and are firing mortars, it's easy to figure out which way to point the mortar. These aren't horribly complicated pieces of equipment. Making sure they stop where you want them to and don't go an addition 100 yards, that can be tricky, but it means the Ukr forces may overshoot the rebels' positions.

What's ruled out is any overshooting of the Ukr force's position by rebel forces. A priori.

Although the nice runs by Russian helicopters and UAVs have kept that kind of thing to a minimum, serving as spotters and targeters for the rebel forces.