51�Թ�

The lawsuit comes amid a national debate over the use of drones by government agencies who have increasingly relied on the unmanned aircraft during disasters and for environmental monitoring and responding to emergency calls.

It will recommend the deployment of new "digital" experts alongside troops to protect them from enemy drones and to control the army's own, future, unmanned weapons.

But minutes after separating from Super Heavy, it was clear something was wrong with the unmanned spacecraft.

The tough conditions on Mars have been underlined by the experience of the unmanned Curiosity rover.

Experts say the tit-for-tat attacks mark a dangerous new phase in the decades-old rivalry, as both sides exchange not just artillery but unmanned weapons across a volatile border.