On 1 November, Imre Nagy received reports that Soviet forces had entered Hungary from the east and were moving towards Budapest. Nagy sought and received assurances (which proved false) from Soviet ambassador Yuri Andropov that the Soviet Union would not invade. The Cabinet, with János Kádár in agreement, declared Hungary's neutrality, withdrew from the Warsaw Pact, and requested assistance from the diplomatic corps in Budapest and Dag Hammarskjöld, UN Secretary-General, to defend Hungary's neutrality. Ambassador Andropov was asked to inform his government that Hungary would begin negotiations on the removal of Soviet forces immediately.