Analysts say Obama trying to wean Caribbean islands off Venezuelan oil in first presidential visit for 30 years.
"The amount of movement and sophistication of the network overwhelms our ability to stop everything."
Principality's credit rating downgraded after U.S. claims of illegal money flows from Russia, China and Venezuela.
Declaring a country a national security threat is the first step in starting a sanctions regime.
The country denied any violation of international airspace.
A U.S. citizen who illegally entered North Korea delivered a lengthy denunciation of U.S. domestic and foreign policy on Sunday.
In a tremendous upset, Turkey lost a contest in the General Assembly, exposing increasingly contentious frictions with some of its neighbors and world powers.
The could lift the lid on the illegal drugs trade and aid to Colombian guerrillas
Venezuelan authorities are investigating a power outage that began on Friday afternoon and was affecting a large swathe of the country
The camps had been blocking traffic along a main avenue of the capital for weeks
As protests against the government continue, the opposition movement is divided over whether or not to sit down with the country's president, Nicolas Maduro