cygwin-3.2.0 + windows 10 - russian cyrilic input is broken

[Eugene Klimov]

LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_ALL=en_US.UTF-8
TERM=xterm-256color

when i run cygwin.bat from any cmd.exe
or just run bash.exe
and try to input cyrillic characters
some of symbols echoed wrong
look to screenshot
https://monosnap.com/file/nTjoi16aqBRcOhzj88S25h7YEkAUS7
some of input character wrong interpreted on cygwin side, wrong
interpretation depends on keypress speed
when i run mintty.exe, everything is fine