The damage has been done. Europe’s economy is tumbling. Ukraine’s currency is in shambles, at a point that the IMF will not be able to bail it out without putting its other member economies at risk. Russia got the Crimea for low cost to itself. Russia does NOT want Ukraine right now as it will damage the rest of the Customs Union. And, Russia can come back for the rest of Ukraine when it suits itself.
Reuters reported that the annexation of Crimea has already cost Russia a trillion rubles.