A ruling Liberal Democratic Party task force compiled a proposal Tuesday for Japan to impose additional economic sanctions on North Korea in light of lack of progress on the issue of the North''s past abductions of Japanese nationals, party members said. The LDP plans to soon give to Chief Cabinet Secretary Takeo Kawamura the six-point proposal, including a total ban on exports to North Korea and prohibiting foreign crew of ships from landing in Japan if they had a hand in imports and exports between Japan and North Korea.