Russia is the world’s seventh-largest copper producer, accounting for about 4% of global production. But its role on the London Metal Exchange is more significant, since it is the third-largest exporter of refined copper metal, the form deliverable on the exchange, after Chile and Japan.

Metal from Russian producers like MMC Norilsk Nickel PJSC and Ural Mining and Metallurgical Co OJSC has historically represented a meaningful share of the copper in LME warehouses.

https://www.bloomberg.com/news/articles/2022-03-18/lme-s-copper-industry-group-recommends-banning-russian-metal