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

Username	Date	Post Link	Relevance	Offered Matches	Sought Matches
u/depleiades	2024-10-16	Post	`8`	German (C2), Russian (Native)	French
u/dmitryy16	2024-10-27	Post	`8`	German (B2), Russian (Native)	French
u/babatewow	2024-10-30	Post	`8`	German, Russian	French
u/olexanderch	2024-11-07	Post	`8`	German, Russian (Native)	English
u/daright	2024-11-17	Post	`8`	German (B2), Russian (Native)	English

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