DR Congo President Étienne Tshisekedi ventured to the heart of the country’s cobalt mining territory to personally deliver a warning to foreign investors (read Chinese) that unfair mining contracts are going to be re-negotiated. On Thursday, the president traveled to the city of Kowlezi in the southern province of Katanga where foreign investors run around 40 mining operations — 30 of which are owned by Chinese entities.

That’s sparked speculation that the President is setting his sights on the Chinese in particular. “I have really had enough!” the president told thousands of supporters in the city center.“I am very severe with these investors who come to enrich themselves alone. They come with empty pockets and leave billionaires.”