Mao talks about the commonality and camaraderie between two socialist nations.
Step-by-step explanation:
Mao Zedong here is outlining the basic tenets a socialist country is ideologically based on, that the working class is in power and there is no exploiting class to be over them.
This is supposed to do away with exploitation and create a uniform society This uniformity would make two socialist countries alike and not hamper national interests which is a point Mao makes here. Of global fraternity compatible to patriotism.