sentences:  Later, the 2nd Red Banner Army entered the Kalochzhan and Lyunchzhen regions, the 15th Army entered the Sansin region, and the 5th Rifle Corps entered the Boli region.The Japanese armies failed to offer significant resistance in these regions, and by August 20, they began to surrender and move into Soviet captivity.On August 11, elements of the 16th Army began an offensive in Southern Sakhalin and by August 18 they had captured most of the island.