Asked by Sputnik in Belgrade if Moscow was going to stop rocket engine exports to the United States, Maria Zakharova said Friday that, "We are working on response measures."
The United States said Wednesday it would impose sanctions on Russia on or around August 22 after blaming it for the March poisoning of a Russian ex-spy in the English town of Salisbury.
The first wave of action will be related to exports of sensitive national security material to Russia, a US official said. It may be followed by a second batch of "draconian" sanctions in 90 days. The restrictions will not concern space, where the United States depends on Russia to transport its crews and cargo.