Japan approved fresh economic sanctions against Iran on Friday after the United Nations asked Tokyo to tighten restrictions against Tehran over its controversial nuclear enrichment program, an official said. The measures approved by the Cabinet of Prime Minister Naoto Kan include an asset freeze on 88 entities, 15 banks and 24 individuals, trade ministry official Hideaki Fujisawa said. Japan had previously frozen assets on 75 entities and 41 individuals. The individuals are also banned from entering Japan, Fujisawa said. The United Nations approved a fourth round of sanctions against Iran in early June over accusations that Tehran is seeking to develop atomic weapons. Iran denies its nuclear program is militaristic in nature and says it has a right to conduct uranium enrichment for peaceful purposes.