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This is what my dictionary says;

сбой masc.
1) misstep; mishap; breakdown (not mental)
2) chitlins (can also be leg or brain)

As a matter of fact I think your sentence says:

In these conditions developed countries become more dependant on unexpected failures in supplies.

But you better wait until someone else can...

сбоев. I think it is "failures" or the likes of.