The past week saw developments in three notable areas that this tracker has covered for over a year — the China-Pakistan relationship, the China-US relationship and China’s sudden removals of senior military figures under what it terms an anti-corruption campaign. First, the South China Morning Post reported comments from an engineer working for a developer of China’s advanced fighter aircraft. Zhang Heng said in an interview about the India-Pakistan conflict last year that “At the support base, we frequently heard the roar of fighter jets taking off and the constant wail of air-raid sirens… It was a real ordeal for us, both mentally and physically.” This is the first admission from China of providing direct military support to Pakistan last May. Until now, officials had rejected the suggestion of collaboration and only spoken of Pakistan using previously purchased Chinese military hardware. We then turn to US President Donald Trump ’s official visit to Beijing, which will be his first in this term.…