The 2017 deployment of THAAD defense missiles by the United States military in South Korea in response to North Korean missile tests has been protested strongly by the Chinese government, concerned that the technologically advanced missile defense could be used more broadly against China. Relations between the governments have cooled in response, with South Korean commercial and cultural interests in China having been targeted, and Chinese tourism to South Korea having been curtailed. The situation was largely resolved by South Korea making significant military concessions to China in exchange for THAAD, including not deploying any more anti-ballistic missile systems in South Korea and not participating in an alliance between the United States and Japan.