On 9 August, the Soviet Union began the invasion of Japanese Manchuria (Manchukuo) with a three-Front assault on the Kwantung Army. Attacking the heavy concentration of Japanese troops in eastern Manchuria from the region between Vladivostok and Khabarovsk, the 1st Far Eastern Front linked up with Marshal Rodion Malinovsky's Transbaikal Front in the west in a successful entrapment achieved with concealment and surprise while Army General Maxim Purkayev's 2nd Far Eastern Front joined in from the north. Concurrently, elements of the Front's 25th Army fought into Japanese Korea with the support of Naval Infantry deployed by the Pacific Ocean Fleet.