visiting the heavily fortified border, warning north korea and reminding them about the u.s. strike in syria and the u.s. bomb dropped in afghanistan a week later. and late today, our correspondent asking president trump, what s next? abc s chief global affairs correspondent martha raddatz reporting from south korea tonight. reporter: tonight, a defiant north korea pledging to conduct missile tests on a weekly, monthly and yearly basis, accusing the white house of pushing the situation there to the brink of war. thermonuclear war may break out at any moment on the peninsula. reporter: but now from president trump a blunt warning. any message for north korea? you got to behave. reporter: in pyongyang this weekend kim jong un s military might on full display, including what appeared to be a new long-range ballistic missile, canisters of green camo mounted on huge transporters, but amid that show of force, an