I found this source about Belgium imports of uranium [1]. The partner "World" is about 50% of the total. These data are from 2023.

Maybe something changed in 2024 because [2] "Belgian nuclear plants no longer run on uranium from Russia". It ends with "Engie does not disclose how many different contracts were concluded and with which suppliers, but does say it obtained a sufficient geographical spread of its supply, Belga News Agency reports." So who knows.

[1] https://wits.worldbank.org/trade/comtrade/en/country/BEL/yea...

[2] https://www.brusselstimes.com/1080337/belgian-nuclear-plants...