I found the following users who may fit your language exchange criteria:

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/4-trimethyloctane	2022-09-21	Post	`5`	English	Russian
u/itsabird6	2022-08-11	Post	`5`	English	Russian
u/anonchandoesreddit	2022-09-21	Post	`5`	English	Russian
u/internetlevel3709	2022-08-21	Post	`5`	English	Russian
u/redevilslug	2022-10-01	Post	`5`	English	Russian

Please feel free to comment on the above posts to get in contact with their authors.