My father's been back home from the hospital since Monday - thank you all again for the warm wishes, thank you so very much!
I'm yet to see (and to hear) him.
He does go for walks, I've been told. The first one was while he was still at the hospital, around the Kyiv Mohyla University campus nearby: he sneaked outside at 7 am, very typical. It wasn't too hot yet, and my over-protective mama wasn't there yet, too. Father's roommate told on him later, when mama arrived.