Russia's current military position in Ukraine is very exposed and has come at a great cost relative to its limited political gains. The strategic bastion of Crimea is defensible as an island but is subject to potential isolation. The position of Ukrainian separatists and their Russian backers in eastern Ukraine is essentially a large bulge that will require heavy military investment to secure, and it has not necessarily helped Moscow achieve its larger imperative of creating defensible borders. This raises the question of whether Russia will take further military action to secure its interests in Ukraine.

To answer this question, Stratfor examined six basic military options that Russia might consider in addressing its security concerns in Ukraine, ranging from small harassment operations to an all-out invasion of eastern Ukraine up to the Dnieper River. We then assessed the likely time and forces required to conduct these operations in order to determine the overall effort and costs required, and the Russian military's ability to execute each operation. In order to get a baseline assessment for operations under current conditions, we initially assumed in looking at these scenarios that the only opponent would be Ukrainian forces already involved in the conflict.

One of the most discussed options is a Russian drive along Ukraine's southern coast in order to link up Crimea with separatist positions in eastern Ukraine. For this scenario, we assumed that planners would make the front broad enough to secure Crimea's primary water supply, sourced from the Dnieper, and that the defensive lines would be anchored as much as possible on the river, the only defensible terrain feature in the region. This would in effect create a land bridge to secure supply lines into Crimea and prevent any future isolation of the peninsula. Russia would have to drive more than 400 kilometers (250 miles) into an area encompassing 46,620 square kilometers, establish more than 450 kilometers of new defensive lines, and subdue a population of 2 million.