quality:corruption, information:extraction
Further naval expansion

Despite the opposition of some of his Confucian-trained advisers, Kublai decided to invade Japan, Burma, Vietnam, and Java, following the suggestions of some of his Mongol officials. He also attempted to subjugate peripheral lands such as Sakhalin, where its indigenous people eventually submitted to the Mongols by 1308, after Kublai's death. These costly invasions and conquests and the introduction of paper currency caused inflation. From 1273 to 1276, war against the Southern Song dynasty and Japan made the issue of paper currency expand from 110,000 ding to 1,420,000 ding.