The United States and South Korea have reached an agreement "in principle" on sharing the cost of stationing U.S. troops in the Asian country, the State Department said Monday, in a move likely to have implications for Japan.

"The United States and the Republic of Korea have reached an agreement in principle on a new Special Measures Agreement," a spokeswoman said. "Both sides are committed to working out remaining technical issues as quickly as possible."

CNN quoted an State Department official as saying that under the revised agreement, South Korea would boost its financial contribution to nearly $1 billion.