In the early 1960s, the United States had ”examined” the Soviet interest in joint action against China`s nuclear facilities; The Soviets were now studying how the United States would react if the USSR attacked the facilities.  While in August 1969 the Central Intelligence Agency noted that ”neither side wants the fiery border situation decommissioned,” the Central Intelligence Agency described the conflict in the President`s Daily Briefing as ”explosive potential.”  The agency stated that ”the potential for war between them is clearly present,” including a Soviet attack on Chinese nuclear facilities, while China ”seems to regard the USSR as its most immediate enemy.”  This dispute concerns part of the ancient land border near the Granitnaya River, which borders part of Heilongjiang province and the Usuriysky district (now Usuriysk district) of the Primorsky region. The original agreement from Beijing stipulates that this section of the border lies along the Granitnaya River, but the origin of the river was de facto inside Russian territory. With the 1991 agreement, Russia transferred 9 km2 to China, so that the Sino-Russian border now runs the entire length of the river. The Chinese historian Li Danhui wrote in ”As early as 1968, China began to prepare a small war at the border.”  It found that before March 1969, Chinese troops had twice attempted to cause a collision along the border, ”but the Soviets, who felt weak, did not take up the Chinese challenge and withdrew.”  Another Chinese historian, Yang Kuisong, wrote: ”There were already important preparations in 1968, but the Russians did not come, so the planned ambush was not successful.”  At the intersection of the Suifen and Granitnaya rivers, a delta is formed which is also the border place. In 1903, the Russian Empire took control of the delta. The delta was then handed over to Mandchoukuo, which was later restored to China, but the Soviet Union retained control of the islands along the river. These islands have been transferred to China. 44 The Wall Street Journal reported on 2 January 1968 that the Chinese authorities in Sinkiang had replaced all Uighurs and Khazaks within 15 to 30 miles of the Soviet border with Chinese armed with rifles and plows.