Japanese Finance Minister Katsunobu Kato said on Friday he was aware of bond market concerns about the country's fiscal policy ahead, in the build-up to an upper house election where the minority government is poised for another setback. Japanese government bonds plunged this week, sending yields on 30-year debt to an all-time high, after polls showed Prime Minister Shigeru Ishiba's coalition was in danger of losing its majority in the upper house vote on Sunday. "I'm aware of bond market views