I'm trying to get expand Russia to increase on the Soviet Empire There's obviously a limit to how big you can expand even with Russia and 5* civics (police state, state property, occupation) enabled so I was planning to do this with Vassals. I've already got a fairly large Persia (Soviet Gilan), Mongolia and Japan but Japan goes from stable to collapsing in about 3 turns, as does Mongolia. Other than liberating two cities on the Asian mainland which are Russian anyway (that's why I went to war with them) is there a way of stabilising them and stopping them from collapsing? Gifting tech, resources etc? Would gifting them workers or settlers help, They have the Japanese mainland and Mindanao island (Davao and one other city). I thought that would be big enough for them. I think I've stablilised Mongolia by giving them a couple of captured Chinese cities and liberating a few of their less productive cities but I'd rather find another way.