Southeast Asia Treaty Organization
As Foreign Minister, he represented Pakistan at the Manila Treaty Conference in September 1954. Support for the Manila Pact in Pakistan was divided, with West Pakistan dominated army and a handful of leaders in favour of this, while most elected members of the Constituent Assembly from West Pakistan and all of the Assembly members from East Pakistan opposed it. Zafarullah signed the Manila Pact, committing Pakistan's accession to the Southeast Asia Treaty Organization (SEATO).