topics Strategy, plans, priorities The People's Liberation Army Navy has become more prominent in recent years owing to a change in Chinese strategic priorities. The new strategic threats include possible conflict with the United States and/or a resurgent Japan in areas such as the Taiwan Strait or the South China Sea. As part of its overall program of naval modernization, the PLAN has a long-term plan of developing a blue water navy. Robert D. Kaplan has said that it was the collapse of the Soviet Union that allowed China to transfer resources from its army to its navy and other force projection assets. China is constructing a major underground nuclear submarine base near Sanya, Hainan. In December 2007 the first Type 094 submarine was moved to Sanya. The Daily Telegraph on 1 May 2008 reported that tunnels were being built into hillsides which could be capable of hiding up to 20 nuclear submarines from spy satellites. According to the Western news media the base is reportedly to help China project seapower well into the Pacific Ocean area, including challenging United States naval power. During a 2008 interview with the BBC, Major General Qian Lihua, a senior Chinese defense official, stated that the PLAN aspired to possess a small number of aircraft carriers to allow it to expand China's air defense perimeter. According to Qian the important issue was not whether China had an aircraft carrier, but what it did with it. On 13 January 2009, Adm. Robert F. Willard, head of the U.S. Pacific Command, called the PLAN's modernization "aggressive," and that it raised concerns in the region. On 15 July 2009, Senator Jim Webb of the Senate Foreign Relations Committee declared that only the "United States has both the stature and the national power to confront the obvious imbalance of power that China brings" to situations such as the claims to the Spratly and Paracel islands. Ronald O'Rourke of the Congressional Research Service wrote in 2009 that the PLAN "continues to exhibit limitations or weaknesses in several areas, including capabilities for sustained operations by larger formations in distant waters, joint operations with other parts of China’s military, C4ISR systems, anti-air warfare (AAW), antisubmarine warfare (ASW), MCM, and a dependence on foreign suppliers for certain key ship components." In 1998 China purchased the discarded Ukrainian ship Varyag and began retrofitting it for naval deployment. On 25 September 2012, the People's