Maybe they are overstretched, i don't know. And even if they aren't, my guess is that they are close to. But they have sent weapons to Venezuela already, to Iran too, also troops to Burkina Faso and elsewhere. They have some presence. Is it enough? I guess it would depend on the situation. Probably not much to expect, except in some cases like Belarussia. Still they outperform NATO in weapon production (according to NATO)
https://www.businessinsider.com/russia-ammunition-production-nato-mark-rutte-2025-6?op=1