U.S. tariffs could cause the prices of steel and aluminum cans to rise, an increase that may ultimately be passed on to consumers.

One of Ukraine’s largest steel plants lies in the country’s industrial east, where Russia’s 3-year invasion of its neighbor threatens to throttle production at any moment.

The European Commission is investigating whether to tighten its current system of quotas on steel imports to protect EU producers from new tariffs U.S. President Donald Trump plans to impose on incoming steel and aluminium on March 12.