Historicaly (i mean from last strat) Eastern Tsardom was vassals of Fallen, no?
About Hospitalers, if i remember they were eradicate from the map by fallen, so they may want to retaliate (they were smaller at that time).
Honestly, if ATS and TS and Hosp want to pick a fight with Fallen and HRE and the Khans, then I am ok with that 2-1 ratio I will enjoy, as well as us being able to attack them with our NA guys on their NA servers, and then defend with an EU server with our EU guys just to fuck with their pure NA roster. It would be amusing. Win or lose, there will be a lot of rage threads, and I get to fight in a real war!
Wars are so much more interesting then peace times, even if losing and not winning.