To secure that, in a tight manner, you need such an enormous amount of troops, he said. So its possible to invade, its possible to seize some parts of Ukraine, but its probably impossible to keep them.
At the International Institute for Strategic Studies, retired British Brigadier Ben Barry says Russia could also face other challenges in eastern Ukraine, where the percentage of ethnic Russians is much lower than in Crimea.
There would be the prospect of some sort of long-term Ukrainian peoples war, guerrilla movement, terrorism, he said, something that would militarily oppose the occupation by the Russian forces in the long term.
In addition, the international community would likely increase the economic and diplomatic isolation imposed on Russia because of the Crimea takeover. International moves so far have been criticized as weak.
But Russia expert Sutyagin says they are already costing Russia tens of billions of dollars and serve as a significant deterrent to further adventurism.
Economic measures being undertaken by NATO members are much more serious than any sanctions or military moves, Sutyagin said.
Experts also say Russia could achieve many of its apparent goals for Ukraine without invading again, including the weakening of the Kyiv governments influence in the east, making the region economically dependent on Russia, and sending a message to NATO not to even consider putting troops on its border.
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