VI. President Black of the Republic of Pasensya (RP) had a telephone conversation with President Blue of the People’s Republic of Conquerors (PRC). In that conversation, both leaders agreed that they will both pull-out all their vessels, civilian or otherwise, sea crafts and other ships from the hotly disputed Kalmado Shoal area within eight (8) days in order to de-escalate the situation. After eight days, all RP ships and vessels have left the area. However, several military and civilian ships carrying the PRC flag remained in the area and began construction of a dock that could provide fuel and other supplies to vessels passing by. Assuming that President Black and President Blue both had full capacity to represent their states and negotiate with each other under their respective systems of government, and further assuming that both leaders acknowledge the existence of the conversation, is the verbal agreement via telephone binding under international law? Explain. (5%) Assuming the answer to (a.) is in affirmative, does that agreement constitute a Treaty under the 1969 Vienna Convention on the Law on Treaties? (2%) What are the sources of International Law? (2%) What is opinio juris in International Law? (1%)