It is XY through whom we have established non-standard relations with our partners.
I would like to express that thanks to a particular person we gained our goals. Do you find the form "through whom" OK in that sentence?
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"It's XY through whom ..." or "it's through XY that we have ..."
The sentence is correct grammatically. You can also say:
We have established non-standard relations with our partners through XY.
However, the first sentence, which is a cleft sentence with the use of it's, emphasizes the subject XY, and the second sentence is a simple sentence.