One glance at the following chart prepared by the Economist, showcasing the world's largest importers of weapons, and more importantly, exporters, and one could almost imagine why both the US and Russia have an interest in a "contained" (or not so much) regional war...
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Some more insight:
Five countries—America, Russia, Germany, China and France—accounted for three-quarters of international arms exports over the past five years. China tripled its share in that time, overtaking France. It is on track to surpass Germany to become the third-largest arms dealer. Business is brisk. Overall, sales between 2009 and 2013 were 14% higher than the previous five-year period, according to the Stockholm International Peace Research Institute, which tracks the arms trade. China sells to 35 mainly low- and middle-income countries, but is also a big importer (two-thirds of its weapons come from Russia). America exports to over 90 nations, with aircraft making up most of its sales. Russia exports more ships than any other country. Its weapons exports have significantly increased, thanks in part to being India's biggest supplier, accounting for three-quarters of its arms purchases. As for Ukraine, it exports more weapons than Italy or Israel. But with regional tensions flaring, it may choose to keep some of those arms for itself.
Source: Economist [10]