So much we do n't know -- five unanswered questions . The Ukrainian Prime Minister and his Cabinet resign but remain in place until elections . More than 400 people have died in eastern Ukraine fighting , government says . - March 18 : A ceasefire is agreed between the rebels and Kiev after talks with Russian President Vladimir Putin at a summit of leaders from Russia, Ukraine, Germany and France. A rebel leader raises new uncertainty about how Flight 17 was shot down .
The Ukrainian Prime Minister and his Cabinet resign but remain in place until elections . More than 400 people have died in eastern Ukraine fighting , government says . - March 18 : A ceasefire is agreed between the rebels and Kiev after talks with Russian President Vladimir Putin at a summit of leaders from Russia, Ukraine, Germany and France. A rebel leader raises new uncertainty about how Flight 17 was shot down .