evidence: In 1938, to develop the natural resources of its coastal strip and to protect its borders against a potential Japanese invasion, the Soviet Union began construction on a railway line from Baranovsky Junction (on the Trans-Siberian Railway) to Kraskino. The 190-kilometre (120 mi) route was completed in 1941. After World War II, it was extended from Kraskino to Khasan, on the Korean border, bringing its length to 238 km (148 mi). The Khasan station opened on September 28, 1951. Soon after, a temporary wooden bridge was built across the Tumen River, and in 1952, the first train crossed from Russia to North Korea. In 1990, the Soviet Union and North Korea signed an agreement establishing a border along the fairway of the Tumen. The former Noktundo Island, 32 square kilometres (12 sq mi) in size, was recognized by North Korea as part of Russia. This agreement was not accepted by South Korea, which continues to view Noktundo as Korean territory.