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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/randomskydiver	2024-02-09	Post	`7`	English	English, Russian
u/interestingtoe1927	2024-03-12	Post	`7`	English	English, Russian
u/embarrassed-wait6641	2024-04-02	Post	`7`	English (C2)	English, Russian
u/neotichaha	2024-04-09	Post	`7`	English (B2)	English, Russian
u/fartofgenius	2024-04-11	Post	`7`	English (C2)	English, Russian

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