苏俄政府拒绝帮助孙中山先生实施西北军事计划缘自保护其本身利益。具体而言,苏俄拒绝孙中山西北军事计划主要因为担忧帝国主义联合干涉殃及苏俄自身利益、孙中山实力薄弱不能确保苏俄中东铁路利益、顾忌孙中山与其仇敌张作霖的密切关系及因此可能导致俄日关系恶化、不愿放弃对外蒙古的控制等。 The Soviet government refuses to help Mr. Sun Yat-sen implement the Northwest Military Project to protect itself. Specifically, the Soviet Union’s rejection of the northwestern military plan of Sun Yat-sen was mainly due to fears that the joint intervention by the imperialists would affect the interests of Russia itself. The weak strength of Sun Yat-sen could not ensure the interests of the Soviet Union’s Middle East Railway and scruples Sun Yat-sen’s close relationship with its enemy Chang Tso-lin, Deteriorating relations, unwilling to give up control of Mongolia and so on.