The Russian Blue cat may meow nonstop possibly because it has left its original environment, original mother, and original companions. You need to accompany it more and talk to it. Although it may not understand, this can help stabilize its emotions. If these methods do not work and it continues to meow after staying at your home for two or three days, you should consider whether it is sick.

　　Also, if it lacks a stable shelter, is hungry, or cold, these can cause the Russian Blue cat to meow continuously. First, observe it for a while, and if that does not help, take it to the veterinarian. If the meowing is caused by illness, it can be dangerous to the kitten's life.