MOSCOW, Aug. 10 (Xinhua) -- Moscow considers Washington's new anti-Russia sanctions over the ex-spy poisoning as a declaration of economic war, Prime Minister Dmitry Medvedev said on Friday.

"All I can say is: if they ban banking operations or the use of any currency we will call it a declaration of economic war," he said during his visit to the far eastern Kamchatka Peninsula.

"And we'll have to respond to it - economically, politically or in any other way, if need be. Our American friends should make no mistake about it," he added.

On Wednesday the U.S. State Department announced a new round of sanctions against Russia over the latter's alleged use of chemical weapons on former Russian spy Sergei Skripal and his daughter in the United Kingdom in March.

Moscow regards these sanctions as unfriendly moves harmful to the constructive atmosphere created after the recent summit between Russian President Vladimir Putin and U.S. President Donald Trump, the Kremlin said.?