The classified documents reportedly contain information of anticipated weapons deliveries, US estimates of Ukrainians and Russians killed in the conflict, and force strength estimates, but no specific battle plans.
"We don't have the slightest doubt about direct or indirect involvement of the United States and NATO in the conflict between Russia and Ukraine," Peskov told American broadcaster.
The spokesman added that the level of the US and NATO invovlent is "rising gradually."
"We keep our eye on this process. Well, of course, it makes the whole story more complicated, but it cannot influence the final outcome of the special operation," Peskov said.