Sources? I couldn't find anything with Perplexity:
https://www.perplexity.ai/search/find-the-story-going-around...
https://www.perplexity.ai/search/trouve-les-articles-de-pres...
https://www.perplexity.ai/search/find-the-story-going-around...
https://www.perplexity.ai/search/trouve-les-articles-de-pres...
However, in finding that, I've found some outlets disavowing the story, so treat it as unproven:
https://unn.ua/en/news/did-ukraine-allegedly-provide-the-us-...