Today's top stories from our correspondents around the globe:

1. The first four refugees fly into Phnom Penh after Australia agrees to pay Cambodia $31m in controversial resettlement deal

2. A senior US diplomat has warned that Burundi will become difficult if not impossible to govern if the president runs for a third term

3. A vigil has been held in the Chinese city of Jianli, with hundreds feared dead in a cruise ship disaster

4. Advanced robotics could revolutionise how we explore the universe

Source: Al Jazeera