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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/aelnir	2021-05-10	Post	10	English (Native), Russian	English, Polish
u/vicvalentin	2021-03-29	Post	9	English (C1), French (B2), Russian	---
u/anasnas23	2021-03-11	Post	8	English, Russian	English
u/stolz_erdmaennchen	2021-03-15	Post	8	English, Russian	English
u/methelge	2021-04-09	Post	8	English (C1), Russian	English

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

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