In the meantime Russia has voiced its concerns once again.Moscow's ambassador to Seoul says the THAAD deployment would become a regional security threat, if it becomes a reality.In an interview with Korea's Yonhap News Agency on Thursday, Alexander Timonin said the U.S. missile defense system would *destabilize the entire region.The envoy also warned THAAD could spark an arms race in Northeast Asia and complicate the resolution of North Korea's nuclear issues.He called on Seoul to carefully review the system. to see if it will end up having more negative than positive outcomes.