Pakistan was one of the first countries to establish formal diplomatic relations with the People's Republic of China, and the relationship continues to be strong since China's war with India in 1962, forming a special relationship. From the 1960s to 1980s, Pakistan greatly helped China in reaching out to the world's major countries and helped facilitate US President Nixon's state visit to China. Despite the change of governments in Pakistan and fluctuations in the regional and global situation, China's policy in Pakistan continues to be a dominant factor at all times. In return, China is Pakistan's largest trading partner, and economic co-operation has flourished, with substantial Chinese investment in Pakistan's infrastructural expansion such as the Pakistani deep-water port at Gwadar. Friendly Sino-Pakistani relations reached new heights as both countries signed 51 agreements and Memorandums of Understanding (MoUs) in 2015 for co-operation in different areas. Both countries signed a Free Trade Agreement in the 2000s, and Pakistan continues to serve as China's communication bridge to the Muslim world. In 2016, China announced that it will set up an anti-terrorism alliance with Pakistan, Afghanistan, and Tajikistan. In December 2018, Pakistan's government defended China's re-education camps for a million Uyghur Muslims.