https://www.cnbc.com/2018/07/20/teslas-battery-maker-suspends-cobalt-supplier-amid-sanctions-concern.html

Panasonic said it was unable to determine how much of the cobalt used in batteries it makes for Tesla cars comes from Cuba, a country subject to U.S. sanctions, and that it had suspended relations with a Canadian supplier as a result of its concerns.

The Japanese electronics maker, the exclusive supplier of batteries to Tesla, made the comments following questions from Reuters about whether the batteries contained Cuban cobalt.