China?

https://www.amnesty.org/en/latest/news/2025/05/sudan-advance...

I haven't found any articles implicating the US, which has export sanctions on Sudan. The only thing I could find was something about small arms from the UK.

https://www.theguardian.com/global-development/2025/oct/28/u...

This report https://www.amnesty.org/en/latest/news/2024/07/sudan-constan... lists

> Weapons from China, Russia, Serbia, Türkiye, United Arab Emirates and Yemen identified

Although that seems to be mixing it up a bit, since Turkey and Russia are supporting the SAF.

Also some France-made weapons: https://www.cbsnews.com/news/sudan-civil-war-amnesty-interna...