I can't get rid of russian language in OS interface

Question

I set up my kubuntu 21.04 with the English interface by default, cause I prefer the original version, but with russian regional settings (date, currency etc). As the result of some experiments I've got the following picture: English US is the only language installed, but the whole interface is in Russian here's a screenshot

Locale's output also contains only russian: $ locale

LANG=ru_RU.UTF-8
LANGUAGE=
LC_CTYPE=ru_RU.UTF-8
LC_NUMERIC=ru_RU.UTF-8
LC_TIME=ru_RU.UTF-8
LC_COLLATE=ru_RU.UTF-8
LC_MONETARY=ru_RU.UTF-8
LC_MESSAGES=ru_RU.UTF-8
LC_PAPER=ru_RU.UTF-8
LC_NAME=ru_RU.UTF-8
LC_ADDRESS=ru_RU.UTF-8
LC_TELEPHONE=ru_RU.UTF-8
LC_MEASUREMENT=ru_RU.UTF-8
LC_IDENTIFICATION=ru_RU.UTF-8
LC_ALL=

Though contents of cat /etc/default/locale look correct

#  File generated by update-locale
LANG=en_US.UTF-8
LC_NUMERIC="ru_RU.UTF-8"
LC_TIME="ru_RU.UTF-8"
LC_MONETARY="ru_RU.UTF-8"
LC_PAPER="ru_RU.UTF-8"
LC_NAME="ru_RU.UTF-8"
LC_ADDRESS="ru_RU.UTF-8"
LC_TELEPHONE="ru_RU.UTF-8"
LC_MEASUREMENT="ru_RU.UTF-8"
LC_IDENTIFICATION="ru_RU.UTF-8"
LC_CTYPE="ru_RU.UTF-8"
LC_COLLATE="ru_RU.UTF-8"
LC_MESSAGES="ru_RU.UTF-8"

# update-locale LANG=en_US.UTF-8 doesn't help either.

What am I doing wrong?.. No scripts in my home directory set or change LANG variable.

WMBR, George Hazan