Troop deployments

FILE - In this March 5, 2019, file photo, U.S. National Security Adviser John Bolton adjusts his glasses before an interview at the White House in Washington. Bolton is condemning Venezuela President Nicolas Maduro, saying he is using foreign military personnel to stay in power. Bolton further warned external actors _ those outside the Western Hemisphere _ against deploying military assets to Venezuela or anywhere else in the hemisphere. He says the U.S. will view such actions as "provocative" and a "direct threat to international peace and security in the region." (AP Photo/Jacquelyn Martin, File)

South Korean Foreign Minister Kang Kyung-wha, right, and U.S. Ambassador to South Korea Harry Harris exchange documents at Foreign Ministry in Seoul, South Korea, Friday, March 8, 2019. South Korea and the United States have formally signed a deal that increases Seoul's financial contribution for the deployment of U.S. troops in the Asian country. (AP Photo/Ahn Young-joon, Pool)

FILE - In this July 4, 2017, file photo, a U.S. highly advanced missile defense system called Terminal High Altitude Area Defense, or THAAD, is seen at a golf course in Seongju, South Korea. The U.S. has deployed THAAD in Israel for the first time, the American and Israeli militaries announced, reflecting their shared concerns about Iran's development of powerful missiles. An Israeli army spokesman, told reporters that a THAAD battery, flown in from the U.S. and Europe, arrived Monday, March 4, 2019, at an air force base in southern Israel. (Kim Jun-beom/Yonhap via AP, File)

Russian President Vladimir Putin delivers a state-of-the-nation address in Moscow, Russia, Wednesday, Feb. 20, 2019. Putin said Russia needs to focus on raising living standards. (AP Photo/Alexander Zemlianichenko)

South Korean Foreign Minister Kang Kyung-wha, right, and Timothy Betts, acting Deputy Assistant Secretary and Senior Advisor for Security Negotiations and Agreements in the U.S. Department of State, shake hands for the media before their meeting at Foreign Ministry in Seoul, South Korea, Sunday, Feb. 10, 2019. (AP Photo/Lee Jin-man, Pool)