The purpose of the article is to reveal the aggressive goals of the Japanese so-called “Eastern Maginot Line”, built in 1934-1945, to show the interaction and contribution of the USSR and Chinа in its destruction that opened the way to the liberation of the main strategic points of the Northeast China.  The Soviet Red Army successfully stormed these fortresses during the Manchurian offensive operation, broke the myth of their impregnability, at the cost of lives of thousands of Soviet soldiers forced the Japanese garrisons to capitulate, freed the way for the offensive into the interior of Northeast China. The battles manifested the combat brotherhood of the Soviet and Chinese soldiers, without which the victory would have been impossible. New archival documents about the participation of Chinese soldiers in those operation are used. The urgent problem of preserving the memory of the heroism of previous generations is raised. The respect of the Russian and Chinese sides for history, for preserving the memory of the battles of 1945 and the fighters who died in the battles on the Maginot Line is shown. This respect is shown in search operations with the aim to recover the names of unknown heroes, in establishing memorials at the sites of former fortifications, in patriotic educational work among the young generation, keeping alive the memory about the war.