Russia’s defense ministry says it will treat U.S.-led coalition planes in Syria that are west of the Euphrates River as targets after the U.S. military shot down a Syrian Air Force jet on Sunday.

Moscow has condemned the U.S. downing of the Syrian government fighter jet after it dropped bombs nears U.S. partner forces.

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The Russian defense ministry says in a statement that, starting Monday, it will track all jets and drones of the U.S.-led coalition west of the Euphrates and treat them as targets.

The ministry also called on the U.S. military to provide a full account of why it decided to shoot down the Syrian SU-22.

Russia, a key backer of Syrian President Bashar al-Assad, has been providing an air cover to the government’s offensive on the Islamic State group since 2015.

Russia delivers a warning to the United States after the U.S. shot down a Syrian jet (Alexei Druzhinin/Sputnik, Kremlin Pool Photo via AP)