I'd probably take a look at Crimea as an example; Cause a disturbance/unrest/distraction elsewhere to get the public's attention, start the comms blackout, sneak the little green men in and just overrun every military position. Six fatalities total to annexe the entire region, between both sides. I don't want to make this discussion about who's right or wrong - we're talking about waging war here - but Russia just about deserves to win an award just for how they pulled it off whilst minimizing casualties.
This is a very simplified version of things, don't shoot me.
And apparently I suck at formatting. I need more coffee.
This is a good point I didn't bring up in the OP. Though I believe it's a special case as there was very little reason to believe a Russian intervention was imminent, the central government of Ukraine was in turmoil, local forces in Crimea were mostly Russian-aligned anyway and the military had made little to no preparations to defend the peninsular. All these added up to make the take over much easier for the Ruskies. Regardless, it was done with impressive skill, coordination, speed and deception. If anyone needs a definition for maskirovka, look no further than the annexation of Crimea.