By Steve Holland and Simon LewisCAMP DAVID, Maryland, July 31 (Reuters) - President Donald Trump said on Friday that the United States has not agreed to Ukraine building Patriot missiles but that talks are ongoing, adding that the U.S. must be "very careful about letting somebody build them."

The US president said that Washington was "looking at it"

US president places military plan in doubt despite positive meetings with Voloymyr Zelenskyy in Washington this week. What we know on day 1,619