Talks involving Ukraine, Russia, the U.S. and the European Union produced an agreement Thursday to take tentative steps toward calming tensions in Ukraine. [...] insurgents occupying government buildings in more than 10 cities said they won't leave until Ukraine's interim government resigns. On Tuesday, the disabled athlete ended five days of withering cross-examination by the prosecutor who pounced on apparent inconsistencies in his testimony about the night he killed girlfriend Reeva Steenkamp. The defense team is trying to bolster his account that he shot her by mistake, thinking she was a dangerous intruder. The unprecedented violence has many questioning the ability of Nigeria's military to contain the 5-year-old Islamic uprising. Aircraft, ships and a robotic submarine continued searching in the southern Indian Ocean for the Boeing 777 that disappeared with 239 people on board en route from Kuala Lumpur, Malaysia, to Beijing on March 8. Signals believed to be from the plane's flight recorders were last detected April 8, about the time the batteries on the beacons would have failed. An avowed white supremacist, Frazier Glenn Gross, was charged with the killings Sunday of a doctor and his 14-year-old grandson outside the Jewish Community Center of Greater Kansas City.