"I can express a deep regret and overall, probably, indignation at the fact that the contracted supplies of electrical energy to Russia's Crimea are still not resumed," Dmitry Peskov told reporters.
Peskov noted that he did not have information concerning Russian coal supplies and the possible restriction of those shipments to Ukraine.
Crimea has been without electricity since the weekend after Ukrainian extremist political groups blew up power line towers in Ukraine. Kiev has been unable to repair the towers, as extremists are preventing armed police and company repair trucks from accessing the site.
Earlier this week, Russian Energy Minister Alexander Novak said that Russia could respond to the Crimea blackout by halting coal deliveries to Ukraine.