If they don't already have a valid visa or res permit, the only way in is to apply for a new visa. This is true no matter what country someone is from and has been true for many decades. The difference is:
Visas are currently much harder to get, but not 100% impossible. If it's going to be a Z visa, the hiring organization will have more paperwork to do on their end than would have been the case in 2019.
I have a personal suspicion that visas will be even harder to get until the Olympics are over.