The EU is working on several mandatory supply chain due diligence schemes.
After the conflict minerals regulation (gold, tantalum, tungsten, tin) (applicable on 1 January 2021) and the 2020 proposal for battery parts (which is likely to cover nickel and cobalt), this proposal carried by Commissioner Reynders could have a much broader impact, and apply to all sectors.
... the EU is looking at making multinationals responsible for human rights — and perhaps environmental violations — throughout their supply chains. This turns the issue from a trade thing into a due diligence corporate governance thing and puts it into the enthusiastic hands of Didier Reynders, the Belgian justice commissioner, who is super-keen.
At an EU level, assuming they will be compulsory, the rules could be implemented by expanding existing corporate reporting requirements. More excitingly, the EU could create mandatory due diligence as a legal standard of care for companies to “identify, prevent, mitigate and account for actual or potential human rights and environmental impacts”, with serious fines for violation.