I've said this previously here, but I believe the Chinese carriers would be willing to give up Russia overflights, at least on new routes, if the US would reaffirm the reciprocity model that was the result of hundreds of meetings over 2+ decades. But, if the cap was set at ~70 frequencies/side/week, the Chinese carriers would have no problem maxing out their allotment, and United could presumably cobble together at least 35. But, AA and DL aren't ready to re-enter the arena yet, so their fares would be depressed AND UA's position as the dominant US carrier would be cemented for the next several years, at minimum... basically a lose-lose for AA/DL.