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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/romul14603	2021-01-22	Post	`5`	Russian	English
u/educational_pie7376	2021-02-28	Post	`5`	Russian	English
u/felicit_ir	2021-02-14	Post	`5`	Russian (Native)	English
u/yanaao	2021-01-29	Post	`5`	Russian (Native)	English
u/unnecessarykun	2021-02-22	Post	`5`	Russian (Native)	English

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