Jeb Bush was the most active on Twitter, criticizing Hillary Clinton for her policies on fighting ISIS.
Sanders and Clinton split, while O'Malley said he could offer the perspective of a "different generation."
The widely anticipated U.S. interest rate hike has spelled good news for currencies in South Africa and Turkey, but others are struggling.
Mireia Lalaguna Royo of Spain was crowned Miss World 2015 Saturday, beating 116 other contestants in the international beauty pageant held this year in Sanya, China.
Russia's deployment of the S-400 in Syria is purely for protection, it says, but the move has inadvertently grounded U.S. jets, and Pentagon officials claim Russia was targeting its aircraft.
A new video shows a fighter encouraging the beheading of Shiite citizens in Saudi Arabia, followed by the gruesome execution of an alleged Saudi spy.
Japan will deploy troops and put missiles on islands in the East China Sea to limit China's aggressive moves to claim territory in the South China Sea and East China Sea.
Moscow is lukewarm on the deal, preferring to focus on a joint venture to build the new T-50 stealth fighter jet, the first fifth-generation fighter jet outside of the U.S.
In a "Morning Joe" interview, Republican front-runner Donald Trump seemed unconcerned with allegations that Russian President Vladimir Putin kills political opponents.
The move followed a similar naval maneuver by Russia, which is currently holding eight Turkish ships in its ports after Turkey shot down a Russian warplane.
A Russian tourism company wants to launch four- or five-day tours of war-torn Syria — but such rare trips may actually be illegal.
The Ukrainian government insists that it cannot repay the $3 billion it owes Russia without violating a debt-restructuring deal with other international creditors.
Two major obstacles could compromise a U.N. resolution's effectiveness in crushing the Islamic State group's finances.
At a briefing Friday, the deputy head of Russian Aerospace Forces said that Russia has proof that the jet shot down by Ankara last month did not violate Turkish airspace.
The political future of Syrian President Bashar Assad is set to be the main topic of debate Friday when world leaders meet in New York.
The space agency received $800 million more than what President Barack Obama requested.
"The Force Awakens" is off to an extremely strong start in international markets, putting "Jurassic World" and its record in jeopardy.
Hot on the heels of the Federal Reserve, Hong Kong's central bank raised interest rates by a quarter point. Are others likely to follow too, or will many go the other way and ease monetary policy? David Pollard reports.
Russian sanctions are to end going into 2016, but Kiev will lose access to free trade with Moscow.
The court's ruling on Wednesday comes as Ukraine continues trying to separate itself from Russia and its own past.
In its massive $1.1 trillion spending bill, Congress is set to provide the space agency $750 million more than the Obama administration's request.
Russians face a difficult start to 2016 as inflated food prices and stagnant salaries guarantee a challenge to make ends meet.