G8 leaders are gathering in Northern Ireland - but differences between Russia and the US over what to do on Syria are already looming large.
British Prime Minister David Cameron has vowed to hunt down the "Islamic State" militants who executed hostage Alan Henning. The aid worker is the fourth Western hostage to be executed by the jihadists.
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.
The self-proclaimed Islamic State has released a video purporting to show the beheading of British hostage Alan Henning. Prime Minister David Cameron called the video further proof of IS brutality.
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."
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