South Korea and the U.S. have yet to narrow their differences on sharing the cost of stationing American troops on the Korean Peninsula.
They wrapped up their latest round of negotiations on Wednesday in Washington.
Seoul's foreign ministry spokesman Kim In-chul said the two sides have broadened their understanding, but there's still a divide without elaborating.
He added that the possibility of South Korea joining a U.S.-led initiative to safeguard the Strait of Hormuz wasn't on the table, brushing off speculation that the matter could be used as a bargaining chip.
This comes as Seoul has said that it's contribution to the alliance direct or indirect should be fairly assessed.
He added that the two sides agreed to work to reach a deal at the earliest date given their previous agreement expired in December.
Washington had initially demanded five billion U.S. dollars, but says it has scaled down its proposal.
Seoul is firm on its stance that the figure must be fair and acceptable for both sides.