Some buyers have said they are shunning Rusal's metal, while others are securing price discounts at the same time as the industry negotiates supply deals for 2023.
Reuters sources say the exchange was planning to discuss banning new deliveries of Russian metal so its warehouses cannot be used to offload hard-to-sell stock.
More sanctions on individuals - including those involved in organizing Moscow's ad hoc votes in occupied east Ukraine on joining Russia - are also expected.