The sanctions imposed on Russia by the European Union and the United States do not have international legal grounds, Russian Foreign Minister Sergei Lavrov said.

"Unilateral sanctions have never done any good. They are not legal. And they do not have international legal grounds," Lavrov said at a State Duma sitting.

"Even if we speak about the Ukrainian constitution, the people who grabbed power in Kyiv in an anti-constitutional revolt did that with at least moral support and, I believe, that support was not just moral, by their actions," Lavrov said.

"The trampling upon laws, which aimed to bring their stooges to power, who relied on blatant ultra-nationalists and who were unable to control even Kyiv without them, and accusations of us and Crimeans of breaching Ukrainian laws are totally void from the legal point of view and, I believe, totally unacceptable from the point of view of morals and ethics," Lavrov said.