Pakistan has served as China's main bridge to the Islamic world, and also played an important role in bridging the communication gap between the PRC and the West by facilitating U.S. President Richard Nixon's historic 1972 visit to China.[13] The relations between Pakistan and China have been described by Pakistan's ambassador to China as "higher than the mountains, deeper than the oceans, stronger than steel, dearer than eyesight, sweeter than honey, and so on."[14] According to Stockholm International Peace Research Institute, Pakistan is China's biggest arms buyer, counting for nearly 47% of Chinese arms exports.[15] According to a 2014 BBC World Service Poll, 75% of Pakistanis view China's influence positively with only 15% expressing a negative view. In the Indo-Pacific region, Chinese people hold the third most positive opinions of Pakistan's influence in the world, behind Indonesia and Pakistan itself.