Moscow considers the allegations from the US that the Russian Federation violates the open skies Treaty, was forced to make a number of retaliatory restrictions from 1 January, as notified by the American side, said the official Commissioner of the foreign Ministry Maria Zakharova. "While the overall political course aimed at the further aggravation of relations with Russia, Washington is absolutely groundless has subjected charges of the Russian Federation in violation of the Treaty on open skies and had to take unilateral steps related to creating the maximum inconvenience to the Russian mission "open skies" performed over the territory of the United States. Because of this, and based on the principle of mutuality, Russia was forced to take adequate measures, which are procedural in nature,"