The ones in permafrost are a problem. If they're 'shut in' - something that might happen if the flow through it stops long enough for the water in it to freeze and expand and cause damage, they could take as long as a decade to restart - and that's with the help of Western petro-tech contractors. Those contractors are now gone. The pipelines have a similar issue, but replacement would not be as time consuming or demand the same level of technical expertise.

As it is, not all of those wells in Siberia are in permafrost, so they can be shut down and restarted without much issue (unless a part Russia no longer has access to breaks), but I'd guess those are shut down already.

Not a petro engineer, just from what I've gathered.