Venezuela's government accused opposition leaders of waging a "psychological war" to destabilise the country, as Hugo Chavez battles a lung infection.
Barack Obama rode a wave of anti-war sentiment to the White House but he vowed on Monday to maintain "the strongest military on the planet".
Controversy surrounding the United States military's new Africa Command has forced the Pentagon to put plans for establishing a headquarters in the continent on a slow track.
Drug traffickers have shifted to semi-submersible craft and other smaller, harder-to-detect boats to elude surveillance, causing a sharp drop in cocaine seizures last year, United States officials said on Monday. Admiral Michael Mullen, the chairperson of the Joint Chiefs of Staff, said the message was "loud and clear".
Russian President Vladimir Putin threatened on Friday in talks with United States Secretary of State Condoleezza Rice to abandon a key nuclear-missile treaty, while also telling Washington to freeze plans for a European anti-missile shield. The Kremlin leader said the Cold War-era INF treaty limiting Russian and US short- and medium-range missiles was outmoded.
The United States military plans to detonate a 700-tonne explosive charge in a test called "Divine Strake" that could send a mushroom cloud over Las Vegas. "I don't want to sound glib here but it is the first time in Nevada that you'll see a mushroom cloud over Las Vegas since we stopped testing nuclear weapons," said James Tegnelia, head of the Defence Threat Reduction Agency.