Protesters have attempted to storm Georgia's parliament during a mass rally against a speech inside the chamber by a Russian lawmaker.
Turkey has been given a deadline of the end of July to choose between buying US fighter jets and Russian anti-aircraft missile systems.
US President Donald Trump said the US and UK have the "greatest alliance the world has ever known" in a news conference with Theresa May.
Donald Trump is to meet Prime Minister Theresa May for "substantial" talks on the second day of the US president's three-day state visit to the UK.
US President Donald Trump and First Lady Melania Trump have arrived in the UK for a three-day state visit.
Austria's parliament has voted to remove Chancellor Sebastian Kurz and his government from office in a special parliamentary session.
The big centre-right and centre-left blocs in the European Parliament have lost their combined majority amid an increase in support for liberals, Greens and nationalists.
Theresa May has said she will quit as Conservative leader on 7 June, paving the way for a contest to decide a new prime minister.
Austrian Chancellor Sebastian Kurz has asked for a snap election after his Vice-Chancellor, Heinz-Christian Strache, resigned over a corruption scandal.
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.