Ukrainians may believe whatever they want. No issue there. They...

Ukrainians may believe whatever they want. No issue there. They might have even been the first humans on Earth and the first word ever spoken by a human might have been Ukrainian. You forgot to mention Bishop Luka, of the Russian Church as another person responsible for the building of that cathedral.

If there was a Russian Church, it must have been the Russian flock to support the church. They must have lived on some land as well. That was so long ago.

Ukrainians must have started building the North Church back in 914 as well.