The CUAET is available to Ukrainians who want to come to Canada temporarily. There will be no limit to the number of Ukrainians who can apply through this pathway and eliminates many of the normal visa requirements. All eligible Ukrainian nationals may be able to stay in Canada for up to 3 years so long as they meet the criteria of the CUAET.
IRCC is also waiving many fees for eligible travel and immigration documents, such as Canadian passports, permanent resident travel documents, proof of citizenship, visitor visas, work and study permits.
The Government of Canada is granting exemptions for unvaccinated and partially vaccinated Ukrainian nationals to enter Canada with a temporary resident permit or written notice of approval for an application for permanent residence in Canada.
You can read these details in Ukrainian (Українська) on the IRCC website.