Russia will take corresponding measures to ensure its national security if South Korea deploys the Terminal High Altitude Area Defense (THAAD) system, Alexander Timonin, Russian Ambassador to South Korea, said at a press conference on Friday in Seoul.

According to Yonhap News Agency, Timonin said that the deployment of THAAD in South Korea would pose a threat to security on the Korean Peninsula and would contribute nothing to regional peace. He said the deployment indicates that South Korea would be incorporated into the U.S. missile defense system, which would challenge Russia’s strategic security.

Timonin pointed out that Russia still hopes for South Korea to decide against the deployment.

South Korea’s Ministry of National Defense said on Friday that South Korean Defense Minister Han Min-goo and U.S. Defense Secretary James Mattis have reached consensus on making sure that THAAD is deployed in South Korea this year.