Thanks!
Well, I'm waiting for their reply now, cuz they didn't tell me where to submit my passport in Russia. It seems to me they've decided that I live in Canada or the US, and sending my passport across the ocean while I'm in Russia seems to be a bit risky.
Yes, it exactly says that in step 4
"STEP 4: SUBMIT THE REQUIRED DOCUMENTS
If you do not have a mailing address in Canada or the U.S.A, or if you are unable to submit the required documentation for you or your accompanying family members to the addresses below, please advise IRCC via the IRCC Web form for instructions to submit your documents to the visa office that serves the country where you are.
Please note that our office will not return passports to an address outside North America."
So, you need to contact them asking about the same