oh please, if anyone had a head on their shoulders they'd realize that the "No Russian" level is part of the games plot device. The terrorists mimic US soldiers, speach, and use US weapons to attack a Russian airport in the hopes that they will spark a war between the US and Russia. And guess what... it did. Without that mission, you have no real idea what caused the Russians to invade the US, which makes them even more evil than they would be if you have that scene, at which point, it becomes justified (sort of). Imagine if this happened irl, a group of people, dressed as say.... Chinese soldiers, using Chinese weapons, tactics, and language entered Grand Central and started killing everyone in sight. Chances are, the US would invade China in retaliation. Yeah sure, forensics would come back and prove otherwise, but by then, it would be too late.
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