 Complete the following phrase:  In June 1944 he became deputy commander of 6th Guards Tank Corps within 3rd Guards Tank Army. He participated in the LvovSandomierz Offensive, in the battles defending and expanding the Sandomierz bridgehead, in the VistulaOder Offensive in January 1945. In these operations, he commanded the advanced corps troops, at their point of impact with the German tank units. For heroic actions in the Lvov-Sandomierz operation Colonel Yakubovsky was again ranked as a Hero of the Soviet Union, by decree of 23 September 1944. From April 1945 he was deputy commander of the 7th Guards Tank Corps within 3rd Guards Tank Army, participating in the 