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Twenty-three Russian diplomats have left the UK for Moscow less than a week after being expelled over the poisoning of a former spy in Britain.

The US-led coalition fighting ISIS has observed pro-Syrian regime forces once again conducting a slow build-up east of the Euphrates River near where US troops are present advising local allies, according to multiple US and coalition officials.

Tens of millions of people in some of the world's poorest areas could be displaced by climate change in just a few decades, the World Bank has warned in a report.

View CNN's Fast Facts on the life of Jane Goodall and learn more about the world renowned primatologist and conservationist.

View CNN's Fast Facts to learn more about Elton John, the award-winning singer, composer and pianist.

Read CNN's Fast Facts about George Soros and learn more about one of the most successful investment financiers in the world.

Read CNN's Fast Facts about Elon Musk and learn more about the billionaire entrepreneur behind Tesla, SpaceX and SolarCity.

Read CNN's Facts Facts about Silvio Berlusconi and learn more about the billionaire and former Italian Prime Minister.

One year after Hurricane Maria battered Puerto Rico, there is still a desperate need for help.

Read CNN's Nuclear Power/IAEA Fast Facts and learn more about the International Atomic Energy Agency and nuclear power.

Sunday's landslide election that handed victory to Russian President Vladimir Putin was "overly controlled" and "lacked genuine competition," international election monitors said Monday.

The Middle East today is poised between multiple wars fueling extremism and a burgeoning younger generation looking for a new start.

The UK has reached a joint legal agreement with the European Union on the legal terms of a Brexit transition deal, a milestone development in the tortured negotiations to extricate Britain from the bloc.