Completely reveals their plans for ethnic cleansing.

Well, the true scale of the internal migration is hard to gauge because Russia is Russia, but in classic fashion there's likely been quite a bit of forced migration but could be as many as 800,000 to 1,000,000 people who have been "brought" into Crimea one way or another and a number of native Ukrainians and Tatars have been forcibly relocated.

Edit: and I found one estimate putting the number of internally displaced Crimeans in Ukraine at 20,000 – 100,000 (pg. 2), but another estimate had an upper limit of 200,000