Do they have the hardware for it? There's an embargo on all of the relevant hardware...
They can make their own chips, but on super old equipment, so it'll run hot and poorly. So they'll be limited in what domestically produced equipment can run.
You are right, but you should remember that a lot of them fled the country to skip conscript. Moreover, games are made a very long time, 4-5 years minimum and it costs a lot of money. And to make independent platform you must create a lot of games because no one will buy it if you can't play at anything.