Through French pressure on Libya and the mediation of Nigerien President Hamani Diori, the two countries resumed diplomatic relations on 17 April 1972. Shortly after, Tombalbaye broke diplomatic relations with Israel and is said to have secretly agreed on 28 November to cede the Aouzou Strip to Libya. In exchange, Gaddafi pledged 40 million pounds to the Chadian President and the two countries signed a Treaty of Friendship in December 1972. Gaddafi withdrew official support to the FROLINAT and forced its leader Abba Siddick to move his headquarters from Tripoli to Algiers. Good relations were confirmed in the following years, with Gaddafi visiting the Chadian capital N'Djamena in March 1974; in the same month a joint bank was created to provide Chad with investment funds.