G20 Clashes

Ukrainian President Petro Poroshenko on Tuesday warned of the threat of "full-scale war" and said Russia had sharply increased its military presence on their shared border as tensions escalate between the ex-Soviet neighbours.

US President Donald Trump said on Tuesday he may cancel his scheduled meeting with Russian President Vladimir Putin at the G20 summit in Argentina because of Russia's maritime clash with Ukraine.

The protesters gathered after the close of the summit in the Schanzen district, a stronghold for extreme left radicals which has been the site of multiple confrontations since Thursday.

Small groups of hooded anti-capitalist Black Bloc militants scuffled with German police on Saturday at an otherwise peaceful march against a G20 summit of global leaders in Hamburg, after two days of violent clashes which marred the G20 summit.

Protesters clashed with police and torched patrol cars in the German city of Hamburg today in fresh violence ahead of the G20 summit, police said.

Australia is deploying its largest ever peacetime security operation amid fears of violent protests or extremist attacks when world leaders including US President Barack Obama converge on Brisbane for the G20 summit this weekend.

Ukrainian President Petro Poroshenko on Tuesday warned of the threat of "full-scale war" and said Russia had sharply increased its military presence on their shared border as tensions escalate between the ex-Soviet neighbours.

US President Donald Trump said on Tuesday he may cancel his scheduled meeting with Russian President Vladimir Putin at the G20 summit in Argentina because of Russia's maritime clash with Ukraine.

The protesters gathered after the close of the summit in the Schanzen district, a stronghold for extreme left radicals which has been the site of multiple confrontations since Thursday.

Small groups of hooded anti-capitalist Black Bloc militants scuffled with German police on Saturday at an otherwise peaceful march against a G20 summit of global leaders in Hamburg, after two days of violent clashes which marred the G20 summit.

Protesters clashed with police and torched patrol cars in the German city of Hamburg today in fresh violence ahead of the G20 summit, police said.

Australia is deploying its largest ever peacetime security operation amid fears of violent protests or extremist attacks when world leaders including US President Barack Obama converge on Brisbane for the G20 summit this weekend.