Here are some mentions of those forces.
https://www.google.com/search?q=Russia+100%2C000+Soldiers&rlz=1C1CHBF_enUS1057US1057&oq=Russia++100%2C000+Soldiers&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRg80gEJMTAzODNqMGo0qAIAsAIA&sourceid=chrome&ie=UTF-8
That’s probably the guys that have been holding that long line all along. Not “new”.