Former Brazilian President Luiz Inácio Lula da Silva has been freed after more than 18 months in prison.
US Democrats have made gains in state elections, in what is being seen as a blow to President Donald Trump.
EU ambassadors are meeting to discuss what length of Brexit extension to offer the UK, as MPs consider Boris Johnson's call for an early election.
Turkey and Russia have agreed what they called a "historic" deal aimed at keeping Kurdish forces away from Syria's border with Turkey.
A Brexit deal has been agreed between UK and EU negotiating teams before a meeting of European leaders in Brussels.
The twists and turns of Brexit - after more than three years of negotiations - will dominate an EU summit on Thursday, amid signs of an emerging deal.
Boris Johnson is considering seeking an early general election if MPs wanting to block a no-deal Brexit defeat the government this week.
President Donald Trump has said the US and China will "very shortly" resume trade talks after a weekend of escalating tension with Beijing.
Italy's Prime Minister Giuseppe Conte resigned on Tuesday, effectively averting a no-confidence vote tabled by the far-right League party's leader Matteo Salvini.
Russia's unmanned Luna-25 spacecraft has crashed into the Moon after spinning out of control, officials say.
Donald Trump has confirmed that he will not take part in Republican presidential debates with his rivals in the race for the White House.