Strongly opposed to any sort of sanction regime that results in this.
If Project P in Country A is identified by Country B as a potential target for planting cyber-attack-enabling backdoors, Country B has an incentive to find people to put a backdoor in P.
If Country B is a free country with rights and ethics, they will say "Help us put a backdoor in P. We'll pay you very well for services rendered," or try to get someone who already works for Country B intelligence into P's management structure.
If Country B is an "evil" country, they will do all of the above, but will also tell people of influence in P who live or have family in Country B or its allies, "Help us put a backdoor in P. If you refuse or if the backdoor doesn't work or if the legitimate workers of P find it and remove it before it helps us, you'll be arrested and/or tortured and/or killed and/or your family too."
Removing Russian based kernel maintainers from positions in which they could conceivably help insert a backdoor into the kernel hopefully removes the incentive for the Russian government to threaten (or carry out) horrific violence against these individuals and their families.