`ratpoison` doesn't accept cyrillic key commands

After I switch my keyboard layout to cyrillic setxkbmap -layout "us,bg(phonetic)" -option "grp:alt_shift_toggle" ratpoison stops recognising keys and only states readkey: Unbound key: Cyrillic_tse However when I switch to a terminal and press the same key, ц is typed and that has been bound in ~/.ratpoisonrc: # ~/.ratpoisonrc # Minimal config file for ratpoison. # Meta key - Windows key. # Press before command, not simultaneously. # Basic commands: # s, S - split screen into "frames" # - within a frame, cycle the "windows" open inside it # - next frame # c - create a terminal window in the current frame # r - resize this frame # o - only frame - destroy all other frames # R - remove current frame # Q - quit ratpoison escape Super_L unbind Q bind Q quit bind o only set startupmessage 0 bind Я quit bing о only bind к kill bind ц exec xterm bind с split bind С hsplit