Oleksii Arestovych has held a number of roles in Ukraine. The most visible of them is probably as a spokesman for the office of the President of Ukraine. The highest ranking is probably as an independent consultant to the Chief of Staff of the office of the President of Ukraine. He is a fairly colorful character who was also a very prolific commentator on Russia's war against Ukraine.
Technically, he is not a politician anymore though.
So I am not sure if questions about him as blogger, or as a media/advocacy personality, are on topic.