I would say it would depend upon where your Russian queen came from that took over the hive. If she came from a certified breeder like Coy's, Go for a walk away split. However if the queen is one that came from any other place but a certified breeder, it may be best to get a queen. The reason I say that is simply that in second generation Russian queens that didn't come from a certified breeder the genetics aren't the best and they tend to get angry which is due to the drones that mated with the original queen. So take it with a grain of salt but that's my opinion on that.