Those kinds of large agreements and negotiations take time and effort to set up. With McD all but gone from Russian territory, new contracts would need to be drawn up and negotiated all over again. It's not impossible, but it would take some real organisin' and collective will to make it remotely work as it did before. Not that McD's business model or their food is something worth saving, but the level of know-how and resources needed to handle such a large supply chain without the legal/logistics team unfortunately is not something that you can just jumpstart without significant support, for example from the government. And I sure as hell don't think the Russian government thinks McD is a strategic priority rn.