Yomi attacked agartha a few turns ago. Then nothing...perhaps he got defeated and give up?
Most MP's come down to 1/2 a dozen or so powerful nations sooner or later, so dropouts are no big problem, indeed fights over there lands can result in massive wars breaking out.
If Yomi has given up, he should have turned his nation AI thou, the AI does'nt do too bad a job, Ermor has defeated Oceania once or twice and the AI never gets bored.
By the way, the T'ien Ch'i spy network is excellent.
I know every move my neighbours and in some cases there neighbours make...