The US military is continuing a significant buildup of air and naval assets in the Middle East ahead of planned talks with Iran in Geneva on Tuesday. The pieces are being moved into place both to intimidate Tehran and to have options to strike inside the country should negotiations over its nuclear program fail, multiple sources familiar with the matter told CNN.

US Air Force assets based in the United Kingdom, including refueling tankers and fighter jets, are being repositioned closer to the Middle East, according to sources familiar with the movements.