 Poland's Prime Minister says international donors have promised $6.5 billion in aid to Ukraine during a conference in Warsaw. Elections take place in Britain's Northern Ireland, where public opinion polls suggest the Irish Nationalist Party Sinn Féin could gain the most support. A SpaceX Crew Dragon spacecraft returns from the International Space Station with one German and three American astronauts after six months in orbit. And the German Defense Ministry says it will halt its European Union-led training in the West African nation of Mali but might continue peacekeeping efforts.