Malaysia Prime Minister Najib Razak (L) looks at Australia's Prime Minister Tony Abbott as he speaks at a breakfast with crews from nations involved in the search for wreckage and debris of missing Malaysia Airlines Flight MH370 at RAAF Base Pearce near Perth, April 3, 2014. Najib visited the Australian search base for missing Flight MH370 on Thursday as a nuclear-powered submarine joined the near-four week hunt that has so far failed to find any sign of the missing airliner and the 239 people on board. REUTERS/Rob Griffith/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT POLITICS)