tokyo japanese prime minister shinzo abe say u.s. president donald trump agree sunday international community must step response north korea pyongyang announce test hydrogen bomb abe say agree separately russian president vladimir putin cooperate north korea president trump share view overlook north korea reckless act international community must show resolve apply strong pressure far use abe tell reporters call confirm japan unite state 100 percent together second phone call day fourth since north korea fire missile japan tuesday abe say putin agree north korea reckless act serious threat would maintain close contact issue note russian leader schedule meet week sideline gather vladivostok japan 's abe agree trump putin cooperation north korea