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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/raudonaarbata	2021-01-13	Post	`7`	English (B2)	English, Russian
u/summer_baby861	2021-02-01	Post	`7`	English	English, Russian
u/motanz	2021-01-13	Post	`7`	English	English, Russian
u/ill-raspberry-2215	2021-01-03	Post	`7`	English (Native)	English, Russian
u/ismaelgo97	2021-01-01	Post	`7`	English (B2)	English, Russian

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