President Bush's agenda in Vienna includes Iran, Iraq, Afghanistan and trade. But in a lingering sign of trouble in the decades-old partnership, European leaders, pushed by their electorates, say they'll bring up Guantanamo, Haditha, and U.S. renditions of terrorist suspects too.

A U.S.-EU summit stresses joint resolve in confronting potential nuclear proliferation by Iran and North Korea, but also evinces continued disagreements over trade and America's conduct in the "war on terror."

Edward Alden writes that the U.S.-European Union Transatlantic Trade and Investment Partnership negotiations are "the biggest consolation prize in the history of international trade liberalization."

Charles A. Kupchan argues that unless the growing gap between governance and governed is resolved, the EU may be headed for fragmentation, if not outright dissolution.

Lawrence Woocher and Paul B. Stares argue that North America and Europe represent a promising venue and springboard for improved international cooperation on the prevention of mass atrocities.

Jeffrey Mankoff argues, "The basic logic underlying the Russian proposal for a new [Euro-Atlantic] security architecture is sound."

The debt crisis that has hammered southern Europe since 2010 will have long-lived economic effects, despite the moderation in Spanish and Italian government borrowing costs since the European Central Bank's "Outright Monetary Transactions" initiative last September.

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Britain has long been ambivalent about the European Union (EU) and Britons' low regard for the EU has been exacerbated by the euro crisis. British prime minister David Cameron has said two things. There will be a referendum on Europe before the end of 2017. But before that, Cameron promises to renegotiate Britain's relationship with the EU. Putting these two promises together, the referendum may be less important than one might think.

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Willem H. Buiter, chief economist at Citigroup, discusses break-up risk, sovereign debt restructuring, bank creditor bail-ins, debt mutualization, austerity, and growth in the eurozone.

European leaders met in Brussels to craft a comprehensive solution to the eurozone sovereign debt crisis. Sebastian Mallaby, director of CFR's Greenberg Center for Geoeconomic Studies, and Benn Steil, CFR director of international economics, discussed the outcome of the summit, the role of the continent's banks, the Greek debt crisis, and the eurozone's financial rescue fund.

Germany's Bundesbank remains an influential actor in eurozone policymaking, and its recent disagreements with the ECB raise concerns about managing the zone's debt crisis. This Backgrounder explains.

The eurozone, once seen as a crowning achievement in the decades-long path of European integration, is buffeted by a sovereign debt crisis of nations whose membership in the currency union has been poorly policed.

G8 members offer a mixed picture on meeting Kyoto Protocol targets. The United States continues to refuse ratification.

Without a common policy on migration, Europe is struggling to accommodate rising levels of immigrants from Africa.