Japan will coordinate with overseas authorities and stands ready to take action against market volatility stemming from the Middle East conflict, Finance Minister Satsuki Katayama said on Friday, issuing a fresh warning against sharp yen falls. Bank of Japan Deputy Governor Ryozo Himino also said the central bank will be vigilant to yen moves as they could affect underlying inflation and public perceptions of future price moves. "Yen declines push up consumer inflation by prodding firms to pass on rising import costs," Himino said.