i think the main con of soviet foreign policy was that, of no fault of their own, they assumed the union would never collapse. they had, in a way, made a lot of countries dependent on their aid. you can see the consequence of this is seen in the the complete collapse of the socialist bloc worldwide after '89-91. only 5 survived.

the main con of china’s foreign policy is definently their stalwart non-interventionist stance, they never poke their nose into others business. this can, in some cases, be good. china will not (at least directly) aid another pol pot or a derg