Why Nawaz Sharif Addressed UN General Assembly In English

Nawaz Sharif delivered his speech at the 70th United Nations General Assembly Session in English, Is not it a disrespect of the supreme court's verdict of September 8, in which court ordered federal and provincial governments to use Urdu as an official language, without delay. When Nawaz Sharif is not good in speaking English. Even those head of the states who are well versant in English do speak their national languages when on official tours to other countries. Like Russian president Vladimir Putin, Chinese president Xi Chinping, Japanese premier Shinzi Abe, Indian prime minister Nrendra Modi, and Indian foreign minister Sushmita Swaraj, Cuban president Paul Castro, Iranian president Hassan Rouhani and Ukranian president Petro Poroshenko. When head of the state do not obey the orders of supreme court, how the beaurucracy will speak and write Urdu?