Seoul and Washington will sign a preliminary agreement on defense cost sharing this Sunday.<br />That's according to a diplomatic source here in South Korea. <br />Initial reports indicated South Korea will pay around 9-hundred-25 million U.S. dollars, and that the deal will only cover this year.<br />The Trump administration is believed to have demanded an annual sum of around one billion dollars.<br />Earlier in the week,... the U.S. State Department said the allies had reached an agreement in principle... but gave no details. <br />