 His articles and speeches caught the attention of Dmitry Manuilsky, who would soon sponsor his trip to the Soviet Union and under whose tutelage he would become a high-ranking member of the Soviet Comintern.In 1923, Quốc (Ho) left Paris for Moscow carrying a passport with the name Chen Vang, a Chinese merchant, where he was employed by the Comintern, studied at the Communist University of the Toilers of the East and participated in the in June 1924 before arriving in Canton (present-day Guangzhou), China in November 1924 using the name Ly Thuy.In 1925–1926, he organized "Youth Education Classes" and occasionally gave socialist lectures to Vietnamese revolutionary young people living in Canton at the Whampoa Military Academy.