The aid of Portugal proved to be crucial to the republic's survival. Portugal's São Tomé and Príncipe, a pair of islands south of Biafra, became a center of humanitarian relief efforts; Biafran currency was printed in Lisbon, which was also the location of Biafra's major overseas office.

what was the motive for portugal?

How come same UK, where Ojukwu got his degree let him down when he needed them most?

Biafra is the way. It cannot be subdued. Every world power knows it and they shiver with fear because they know that the realization of biafra would bring abou a change on Earth.