Other mistake: When Katja asks Frank where he found Sarah, Sarah answers Kansas. Actually, her apartment is east of downtown Kansas City, Missouri. In Red, the camera angle shows the Kansas City, MO sky line pointing west and pans down. (00:32:24)
Other mistake: When Katya is told that Frank was spotted in Red Square, she tells the soldier (in the English subtitles) to call out the Army - but she says, in Russian, something about Spetznaz - which Is Special Forces, not Army.
Chosen answer: Perhaps, but against whom? The Americans, the Brits, the Koreans? And having an American citizen found tied to a chair, abused, and murdered would be hard to explain. In addition, their involvement in a narrowly averted nuclear holocaust may keep them from saying too much.
Blathrop