The short answer: Director changes and share transfers in a Ukrainian LLC can be completed while you stay in Canada. The change is documented by shareholder decisions and, for share transfers, a notarized agreement in Ukraine; your part is signed under a power of attorney or before a Ukrainian consul. The main caveat: Ukrainian notaries and registrars read paperwork literally, so names, passport data, and charter wording must match exactly across every document.
This situation usually means a defined chain: a decision by the owners, the corporate documents that evidence it, a notarial act for any share transfer, and a registrar entry that makes the change public. When you are abroad, your signature in that chain is represented — the documents you sign in Canada have to be drafted so the Ukrainian notary and registrar accept them on the first pass.