Strategically selling kit to Russia makes some sense, by improving relations you knock down all the anti-Western/Imperialistic bluster and rhetoric, which Putin likes to spew forth for domestic consumption as a result of the Soviet collapse and loss of prestige. Europe depends on Russian gas imports and Russia depends on Western European engineering/manufacturing/luxury goods imports and she needs to attract increased European investment. The more the two geopolitical spheres trade the more they will rely on each other making a shooting war less, not more likely. By supplying Russia with Western technology you make them part of the supply chain, which cannot be easily severed overnight. I'm not too concerned about Mistral's, these are not strategic multipliers unlike SSN's, strike carriers and/or high-end ISTAR assets.
Russia and Western Europe have a common enemy in the form of Islamic extremism, this should prove a baseline for future cooperation. The war in Afghanistan has seriously called into question the continued viability of NATO anyway (Canadian Government being the latest to question its continued relevance), so when it finally collapses we will see new alliances form based on securing natural resources rather than protecting ideology's (communism vs. capitalism). The need for 'yet to be discovered' Oil & Gas reserves out to 2030 means that developing nations, deep water and the two poles will represent the target areas for future exploration, this will bring new military challenges to Europe, Russia and the US outside of the historical battleground of Europe.
Russia and Western Europe have a common enemy in the form of Islamic extremism, this should prove a baseline for future cooperation. The war in Afghanistan has seriously called into question the continued viability of NATO anyway (Canadian Government being the latest to question its continued relevance), so when it finally collapses we will see new alliances form based on securing natural resources rather than protecting ideology's (communism vs. capitalism). The need for 'yet to be discovered' Oil & Gas reserves out to 2030 means that developing nations, deep water and the two poles will represent the target areas for future exploration, this will bring new military challenges to Europe, Russia and the US outside of the historical battleground of Europe.