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Yes, it would depend on what stockpiles they have but also what reserves they have available to throw at Wagner without compromising the front line. But if they link up with the Ukrainians Wagner could receive reinforcements that way.
Kerch straight bridge is an issue but they might be able to deal with it, the Ukrainians have taken it down before and now they have Storm Shadow missiles. And even if they didn't it still would funnel all their communications and mean communications have to be diverted and things would take longer to move around.