war zone

"The Twin Towers were not in the middle of a war zone," says Ms Darlison, "so it was something we were able to measure and quantify easier".

They were deployed to the war zone at Ukraine's request to monitor the security situation including any ceasefire violations, but they did not explicitly say who committed them.

However, it is unsafe to travel to Nasir - a strategically important port town along the Sobat River - as it has turned into a war zone.

A new Humanitarian Medal has been launched, honouring those who risk their own lives to help others in emergencies and war zones, and the King hailed their selflessness and compassion.

"The person who stays in a war zone is participating in the war, there are no civilians, they are all from the army," he said.