He announced that Portuguese control of Goa could be tolerated no longer and instituted a blockade, which the Portuguese regime evaded by building an airport into which to fly supplies and by opening up trade with Pakistan and Sri Lanka. Portuguese dictator, Antonio Salazar tried to drum up international support from world leaders. President Kennedy wrote to Nehru advising him not to use force and the Portuguese ambassador in London reminded the British government that under the terms of the Anglo-Portuguese alliance of 1899 it was obliged to come to Portugal’s assistance if any Portuguese colony was attacked.