When Ukraine successfully targeted Russia's prized warship last month with anti-ship cruise missiles, it had some help from the United States.
Ukrainian forces, having spotted the Russian warship in the Black Sea, called their American contacts for confirmation that it was in fact the Moskva.
The US responded that it was, and provided intelligence about its location. It is not clear whether the US knew Ukraine would move to strike the ship.
The US has for months provided Ukrainian forces with intelligence about Russian troop movements inside Ukraine, including intercepted communications about Russian military planning. It also provides Ukraine with maritime awareness information to allow the country to better understand the threat posed by Russian ships in the Black Sea, many of which are firing missiles onto Ukrainian territory.
Ukraine combines information that their partners provide with the intelligence that they themselves are gathering on the battlefield, and then they make their own decisions, and they take their own actions.