. >> machar's return is just the first step in a long road towards the reconciliation of communitieshat have been torn apart by the conflict. challengers -- challenge is the head. brent: still to come, remembering chernobyl. ukraine marks 30 years since the world's worst nuclear accident. we will look at the ongoing efforts to contain the fallout here all of that caustic around. ♪ brent: welcome back. our top story, and the u.s., five east coast state are holding primaries to decide who will be running for president. like clinton and donald trump are both looking to extend their lead in the nomination contest. spain is headed for fresh elections. last-ditch coalition talks have ended without result, and that no party has enough support to form a government. spain has been under a caretaker administration since last december. sources in the german government say that the countries spy chief is being replaced. gerhard schindler was reportedly told to go by the chancellor's office today. no official reason has been given for the shakeup. it was the worst nuclear accident that the world