Libya on Saturday threatened to attack a North Korean-flagged tanker if it tries to ship oil from a rebel-controlled port, in a major escalation of a standoff over the country's petroleum wealth.
Mood remains dark in Crimea as Russians enter base
Russian and Ukranian officials are trying to form a contact group to diffuse the crisis in Crimea, but tensions there remain high as a convoy of hundreds of Russian troops enter a base in the provincial capital.
MSN Entertainment's Lucy Mapstone chats to stars of Marvel's Avengers Assemble, including Robert Downey Junior, Chris Hemsworth, Tom Hiddleston, and Mark Ruffalo.
UK Release Date: April 26 2012