Call 613-321-4243, collect calls accepted.
Use the IRCC crisis web form and add the keyword “Ukraine2022”

Submitting Visa Applications for Ukrainians to come to Canada:

Visa applications can be submitted online from anywhere in the world. Biometrics can be given at any visa application centre (VAC) outside of Ukraine. VACs are open in Moldova, Romania, Austria and Poland, and there is an extensive VAC network across Europe. More information about the Canada-Ukraine authorization for emergency travel is also available.