(AGI) Moscow, Sept 8 - The Ukrainian president, PetroPoroshenko has arrived in Maiupol, the eastern harbour citywhere tensions are running high despite the current truce withthe pro-Russian separatists. According to the head ofPoroshenko's press office, the president ordered that defencesbe strengthened, using tanks, missile launchers and airdefences. "The enemy will suffer a crushing defeat", thepresident stated. . .