I’ve seen many threads suggesting products but they often don’t mention FOSS projects, which should always be preferred to corporate software. With FOSS you are already boycotting capitalism, on either side. Free and Open Source ignores borders and shouldn’t be categorized in nationalist terms, no matter where some of the maintainers happen to live.
FOSS doesn’t mean that you are entitled to a place at the table or that your contributions have to be accepted. Nothing prevents these Russian devs from continuing to to work on the kernel.