Senior officials from US, South Korea and Japan met in Tokyo yesterday, amid tensions with North Korea. The meeting was attended by US special envoy Joseph Yun, South Korean special representative Kim Hong-kyun and Japanese Foreign Ministry's Asian Affairs Chief Kenji Kanasugi.<br/><br/>The South Korean special representative told reporters that the three countries would continue to exert pressure on North Korea, adding that punitive measures were also discussed in case Pyongyang should carry out future acts of provocation.<br/><br/>Japanese Foreign Ministry's Asian affairs Chief said, the three countries agreed to strengthen their deterrence power and urged North Korea to exercise restraint. US has maintained its stance that all options, including military action, are on the table regarding Pyongyang's missile and nuclear programs.