RTX could earn $350 million on this arms sale, but how long will it take to book the profit?A new Cold War has begun in Europe, which has implications not just for historians, soldiers, and geopoliticians, but also for investors in the defense industry. The Russian bear is growling, and Germany is rearming -- buying $3.5 billion worth of missiles for missile defense from defense contractor RTX (RTX +0.70%).Last month, the Defense Security Cooperation Agency -- or DSCA, the U.S. Department of Defense divisio ...