VoiceOVer keyboard commands on IOS

Hello! I recently obtained Logitech k380 keyboard and attached it to my iPhone running latest iOS.
Everything works fine, except one very annoying issue.
My native language is Russian but I set my iPhoneinterface language to English to benefit automatic language switching with VoiceOver speech. But when I try to operate my iPhone using keyboard, some of the command work only if my keyboard layout is set to Russian. Those are command that involve letters, such as VO+h to open the Home screen ETC. When I switch keyboard layout to English, those commands stop working. I tried using my keyboard in both Mac and PC modes, but nothing helps.
Any ideas?
Thanks in advance.