Cleared of being multis.
Having a game history together, although may hold some weight at times, does not mean an automatic secret alliance between players. We have to look at the game in question.
I can see that red has 24 troops on Bangkok right now, serving as guards for his Oceania. Who among you is ready to attack that at this stage without weakening yourself in the process as well? Is yellow capable of doing that attack? Yellow has not even held a bonus zone as of yet. Is yellow suppose to focus on red? If red has grown strong at this point, anyone who doesn't attack him must be in secret cahoots with him?
Basing from a game history together, and looking at their position in the map, what we have right now is more on assumptions instead of evidence.