The US and Russia are cooperating in sharing information about US military forces in the Middle East, including coordinates of ships and aircraft. This cooperation could be helping Iran guide its missile attacks in the region, but it’s not explicitly stated that Russia is sharing this info for targeting purposes.
Source: https://www.wsj.com/world/russia-secretly-sharing-location-of-u-s-targets-with-iran-u-s-officials-say-127d4f1a