G8 leaders are gathering in Northern Ireland - but differences between Russia and the US over what to do on Syria are already looming large.
The UK Parliament has voted in favor of joining the military action against the "Islamic State" in Iraq. But for many the decision creates uncomfortable parallels with the mistakes of the 2003 invasion.
It was Barack Obama's big moment. He made his case to the world that the so-called "Islamic State" (IS) must be destroyed. It was just part of a day's diplomacy that one expert sees as a "turning point."
US President Barack Obama says the strength of the coalition of the US and five Arab states showed the "fight against 'Islamic State' is not America's alone." Obama spoke ahead of a visit to the UN later on Tuesday.
The UN Security Council has voted to impose restrictions that "prevent and suppress" extremist groups like the "Islamic State." US and Arab aircraft, meanwhile, have resumed strikes against against IS targets in Syria.
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