They work if they accomplish their goal... have they? Only if the Russians back away in the Ukraine, and that doesn't seem to be happening.
Rumors always spread fast. They don't always turn out to be true.
Again, sanctions have only "worked" if they change Russian policy on the Ukraine, which is what they were intended to do.
Hard to know when, or if, it stops. If oil prices bounce back they can probably get through it pretty much intact. They still have all sorts of problems to deal with, but those aren't caused by sanctions and their impact on the geostrategic equation is not predictable. It is by no means certain that financial stress at home will make Russia less aggressive toward its neighbors.
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