Seoul, April 19 South Korea's presidential Office of National Security on Sunday condemned North Korea's ballistic missile launch as a violation of UN Security Council resolutions, calling for an immediate halt. The office convened an emergency meeting led by Deputy National Security Adviser Kim Hyun-jong to analyse and assess the North's latest missile launch, presidential spokesperson Kang Yu-jung said in a written press briefing.The office expressed concerns over the North's increasingly frequent ballistic missile launches and urged Pyongyang to immediately halt provocations that clearly violate the UN Security Council resolutions, reports Yonhap news agency.It also instructed relevant agencies to step…