National Security Brief: More Americans Killed By Afghan Troops

— Four more U.S. troops were killed Sunday in Afghanistan after a member of the Afghan security forces opened fire on them. Fifty-one NATO and allied troops have now been killed in these so-called “green on blue” attacks this year.

— Defense News reports that “several nonpartisan Washington think tanks have produced analyses that suggest the process known as sequestration might be manageable.”

— As anti-American protests in the Middle East begin to wane, Libyan officials are blaming al Qaeda-linked militants for planning last week’s deadly attack on the U.S. Consulate in Benghazi.

— The Washington Post reports: The commander of Iran’s Revolutionary Guard Corps said Sunday that members of its elite Quds Force are inside Syria but are not involved directly in military work, the first time a senior official has publicly admitted the involvement of Iranian military personnel in the Syrian conflict.

— Iraq’s fugitive vice president said this weekend that Iran in using Iraqi airspace to fly supplies to Bashar al-Assad’s forces in Syria and thousands of Iraqi militia have crossed the border to support his troops.

— Tens of thousands of anti-Putin protesters gathered in Moscow streets on Saturday, “sending the message that its ranks are undaunted by a battery of new government sanctions and the two-year prison sentences handed down last month to the punk-rockers of Pussy Riot.”