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Its main military base, featuring concrete blast walls, watch and communication towers and space for armoured personnel carriers to move inside, is much more developed than the smaller outposts around Sergele.

China has been accused by the US of helping Russia make more munitions, armoured vehicles and missiles.

The soldier was part of a team of four who were conducting military drills in a large armoured vehicle when they disappeared near the city of Pabrade.

In March it announced a collaboration with Patria, a Finnish legacy defence firm, which will trial the tech on its armoured vehicles.

The Congolese armed forces have bought Chinese armoured personnel carriers and drones.