Gordon Brown and Vladimir Putin meeting in 2006
Former British PM Gordon Brown says Vladimir Putin should face an international tribunal over his actions in Ukraine.
The ex-Labour leader is among 140 academics, lawyers and politicians to sign a petition calling for a legal system modelled on the Nuremberg trials of Nazi war criminals after World War Two.
The International Criminal Court is already investigating the Russian leader for alleged war crimes, but some say the ICC's powers are limited.
Writing in the Daily Mail, Brown said creating a tribunal would close off a loophole in international law "that Putin could use to dodge justice".
BBC
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.