As the Trump administration draws up war plans against Iran over what it says are threats to American troops and interests, a senior British military official told reporters at the Pentagon on Tuesday that he saw no increased risk from Iran or allied militias in Iraq or Syria…

Intelligence and military officials in Europe as well as in the United States said that over the past year, most aggressive moves have originated not in Tehran, but in Washington — where John R. Bolton, the national security adviser, has prodded President Trump into backing Iran into a corner.

One American official, speaking on the condition of anonymity to discuss confidential internal planning, said the new intelligence of an increased Iranian threat was “small stuff” and did not merit the military planning being driven by Mr. Bolton. The official also said the ultimate goal of the yearlong economic sanctions campaign by the Trump administration was to draw Iran into an armed conflict with the United States.