Q: Why apple pay doesn't work in ukraine

Hi

This is a user-based technical support community, so I'm afraid that no-one here can tell you about Apple's unannounced plans (whether, when, etc). It is also not allowed here to speculate on Apple decisions. Your best solution is to keep checking Apple's website:

Participating banks: Apple Pay participating banks and store cards - Apple Support

If you are keen to see Apple Pay launch in Ukraine, you can also let Apple know here:

https://www.apple.com/feedback/apple-pay.html