聯俄容共
He negotiated the First United Front between Sun's KMT and the nascent Communist Party of China (CPC), convincing that party, which consisted of only about 300 members at that time, that the alliance was in its long-term interest, as it would facilitate the organisation of both urban and rural workers. Under Borodin's tutelage, both parties were reorganised on the Leninist principle of democratic centralism, and training institutes for mass organisation were established, such as the Peasant Training Institute, where the young Mao Zedong served, and the Whampoa Military Academy, which trained officers for the National Revolutionary Army (NRA) under the leadership of Chiang Kai-shek. He arranged shipments of Soviet arms and shrewdly kept a balance between the middle-class elements of the KMT and the more radical CPC.