by Kris Osborn
One of the limited options cited in the study could include taking huge amounts of time to mobilize and deploy a massive counterattack force which would likely result in a drawn-out, deadly battle. Another possibility would be to threaten a nuclear option, a scenario which seems unlikely if not completely unrealistic in light of the U.S. strategy to decrease nuclear arsenals and discourage the prospect of using nuclear weapons, the study finds.
Current tensions between Russia and NATO are leading many to carefully assess this question and examine the current state of weaponry and technological sophistication of the Russian military -- with a mind to better understanding the extent of the kinds of threats they may pose.
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http://nationalinterest.org/blog/the-buzz/russia-vs-nato-who-would-win-war-22167