"Yes, we did not set any restrictions for Ukraine to strike at territories within its internationally recognized borders," TASS quoted Sullivan as saying in an interview with CNN.
He noted that the United States did not allow Kyiv to use Western weapons to strike at Russian territory.
Earlier, the head of the Crimean parliament, Vladimir Konstantinov, said that the Presidium of the Crimean Parliament intends to initiate the issue of canceling the decision to transfer the peninsula to the Ukrainian SSR from the RSFSR, which was adopted in 1954.
The Kremlin has repeatedly stressed that Crimea is an integral part of Russia, and claims to Russian territory will receive a proper response.
Russian President Vladimir Putin also noted that the issue of Crimea is closed for Russia, and the referendum on the peninsula was held in strict accordance with international law.