The Russian foreign ministry has summoned the US Ambassador, saying Washington has direct responsibility for an attack on Russianannexed Crimea.
Four people were killed by falling debris in Sevastopol on Sunday.
Russia says it shot down five Ukrainian missiles over the port city.
Moscow says US specialists helped oversee the flight path of those missiles.
A Pentagon spokesperson said Ukraine conducts its own military operations.
Al Jazeera’s Daniel Hawkins has more on the Russian reaction from Moscow and White House correspondent Kimberly Halkett with the US response.
Alexandre Vautravers is EditorinChief of Swiss Military Review.
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