Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

Russia's President Vladimir Putin speaks during the youth forum 'Seliger-2014' at Seliger lake, northern Russia, on August 29, 2014. Putin insisted that Kiev must enter substantial talks with pro-Russian rebels amid a dramatic escalation of the fighting in Ukraine. AFP PHOTO / RIA-NOVOSTI / POOL / MIKHAIL KLIMENTYEVMIKHAIL KLIMENTYEV/AFP/Getty Images
Russia's President Vladimir Putin speaks during the youth forum 'Seliger-2014' at Seliger lake, northern Russia, on August 29, 2014. Putin insisted that Kiev must enter substantial talks with pro-Russian rebels amid a dramatic escalation of the fighting in Ukraine. AFP PHOTO / RIA-NOVOSTI / POOL / MIKHAIL KLIMENTYEVMIKHAIL KLIMENTYEV/AFP/Getty Images

    JUST WATCHED

    Putin: Don't mess with us, we're nuclear

MUST WATCH

Putin: Don't mess with us, we're nuclear

Russian Pres. Vladimir Putin has upped the rhetoric over the conflict between Ukraine and Russia. Matthew Chance reports.

Putin: Don't mess with us, we're nuclear

Russian Pres. Vladimir Putin has upped the rhetoric over the conflict between Ukraine and Russia. Matthew Chance reports.