berlin german chancellor angela merkel monday voice support tough u.n. sanction north korea telephone call russian president vladimir putin german government spokesman say agreement conflict north korea nuclear armament must resolve peacefully steffen seibert say statement merkel tell putin support efforts u.n. security council rapidly adopt sanction north korea make pyongyang change course add merkel also welcome russia proposal deploy u.n. peacekeepers address ukraine crisis stress propose mandate need expand seibert say putin signal willingness look idea deploy u.n. peacekeepers contact line donbass region also areas eastern ukraine protect osce officials monitor minsk peace deal add merkel back tough u.n. sanction north korea call putin