 Complete the following phrase:  After the founding of the dynasty, Kublai Khan was put under pressure by many of his advisers to further expand the sphere of influence of the Yuan through the traditional Sinocentric tributary system. However, the attempts to establish such tributary relationships were rebuffed and expeditions to Japan twice, Dai Viet twice during Kublais rule, and Java, would later meet with less success. Kublai established a puppet state in 