Michele Kelemen

Russia's annexation of Crimea has troubled its relations with the U.S. As Russia and the U.S. begin to trade sanctions in retaliation, analysts wonder if this spells a renewal of Cold War rivalry.

Russian President Vladimir Putin has signed a treaty to annex Crimea and delivered a rousing speech to mark the occasion. The U.S. denounced the action as illegal but has few tools to change his mind.

Ukraine's interim Prime Minister Arseniy Yatsenyuk takes his case to the United Nations on Thursday, as he tries to build support for his country in its territorial conflict with Russia.

Ukraine's territorial integrity is under threat. The region of Crimea is expected to vote to secede and possibly join Russia. U.S. efforts to resolve this diplomatically with Moscow have gone nowhere.

Before Secretary of State John Kerry agrees to visit Russia, the State Department says it wants to see concrete evidence that Russia's ready for serious discussions on ending the crisis in Ukraine.

Secretary of State John Kerry met with his Russian counterpart, Sergei Lavrov, in the first direct high-level meeting between the U.S. and Russia since Russia sent troops into Crimea.

Secretary of State John Kerry is having discussions in France on Wednesday with America's allies about the crisis in Ukraine. He also is expected to meet with his Russian counterpart.

Secretary of State John Kerry is in Kiev Tuesday, offering $1 billion in American loan guarantees and promises of technical assistance to the new Ukrainian government.

Refugees once fled to Syria. Now, record numbers are fleeing from it. And the exodus is straining the stability of neighbors who are struggling to support both their own citizens and the displaced.

While Russia carries out military exercises near Ukraine's border and shelters its ousted president, the U.S. is watching closely. But Kerry says Ukraine shouldn't feel pulled between East and West.

The U.S. has wanted better relations with Venezuela, but the new president — like Hugo Chavez before him, say experts — uses the U.S. as a scapegoat to divert attention from domestic problems.

Three months of protests have taken a toll on a Ukrainian economy that was already in distress. But many worry that as in the past, corruption and a lack of political will prevent meaningful reform.

Like many Syrian exiles, Murhaf Jouejati, a professor at National Defense University, is frustrated by U.S. policy toward Syria. He says there's been only a trickle of U.S. aid to the secular, nationalist opposition in Syria, while the Islamists have no trouble raising money through their networks in the Arab ...