The short answer: Inheritance-related documents can be obtained from Ukraine while you stay in Canada: death certificate duplicates, inheritance certificate copies, kinship records, and estate file documents all issue to heirs or their authorized representatives. For use in Canada they travel with a Ukrainian apostille and certified translation. The main caveat: different documents sit in different systems — civil registry, notarial archives, courts — so the request has to go to the right source the first time.
This usually comes up mid-process: a Canadian bank's estate file, your accountant, a pension authority, or the notarial case itself asking for a specific paper. The documents exist in Ukrainian systems; the work is requesting them under proper authority, legalizing them for Canadian use, and delivering them before someone's freshness window closes.