Requesting for assistance.

Hello, am Vincent from Kenya, I need your assistance in regards to my goods which I bought in Ukraine and the supplier has refused to deliver , so kindly direct me to the relevant authority who can help me .

Hi. This is the official website of the Ukrainian Customer Protection Agency. You can contact them.
http://www.consumer.gov.ua/
They have a website in the English language but all you need to know is that they accept complaint via email (head [at] consumer . gov . ua)
Make sure you complaint contains your name, address, email, date of complaint.
They are obliged to reply to your complaint within 30 calendar days.