Greek PM Alexis Tsipras urges voters to reject creditors' demands in Sunday's referendum on its debt crisis, as the country's bailout is set to expire.
Shares in Asia mostly up on Tuesday, beginning to recover some of Monday's losses.
British voters will not accept a "rigid" EU that cannot handle the Greek crisis and the UK's demands for reform, David Cameron says.
Could Russia face new threat from Islamic State in Caucasus?
Why is Greece holding a referendum?
Italian astronaut Samantha Cristoforetti on life in space
Why Greece is on the brink of capital controls
Germany and the US go through a rocky patch
Turning Wimbledon champ Kvitova into a global brand
The ideals once represented by the EU are no longer a rallying point for the continent, as politicians as diverse as Alexis Tsipras and David Cameron demand their own visions of change.
Dealing with crime on the streets of Soho