On 10 July 1945 it comprised 231st and 300th Rifle Divisions as part of 1st Red Banner Army, Maritime Group of Forces.
On 9 August 1945 the corps received an order to commence operations, and to cross the international border in the region of Grodekovo settlement.
In the course of the Manchurian offensive operation the 87th Rifle Corps moved in into the reserve of the 35th Army formations along the northern shore of Lake Khanka.
The 35th Army, from the staging area Guberovo, Ruzhino, Lesozavodsk, delivered the supporting attack of the 1st Far-Eastern Front (commander - Marshal of the Soviet Union K.A.
After assaulting across the Sungach river, the 342nd RD with 357th Rifle Regiment directed its concentrated efforts toward securing the area of Tsikhulin region, Khubey, and Yangan (50 kilometers west of Khulin).
During this time (on 11 to 12 August 1945) the 87th Rifle Corps was brought out from the reserve of the 1st Far-Eastern Front, and received new orders to prepare for landing operations on the Japanese Home Islands of Hokkaido.
At the end of August 1945, the 87th RC moved from Harbin in its entirety (264th, 342nd, 355th RD) and began redeployment to Sakhalin for the purpose of concentrating the troops for the planned landing operation on the island of Hokkaido.
It became part of the 25th Army with headquarters at Chuguyevka, including the 63rd Rifle and 18th Machine Gun Artillery Division from 7 August.