The White House said it did not support attacks inside of Russia and that it was still gathering information on the incident, which Putin called an attempt to scare and provoke Moscow.

"This is an encouragement for Ukrainian terrorists."

Putin on Tuesday cast the assault, which brought the 15-month war in Ukraine to the heart of Russia, as a terrorist act. Ukraine also accuses Russia of terrorism for its bombing of Ukrainian civilians, allegations Moscow denies.

A Ukrainian presidential aide denied Kyiv was directly involved in the drone attack on Moscow, but said Ukraine was enjoying watching events and forecast more to come.

The attack on Moscow, which injured two, came after Russia launched three air assaults within a day on Kyiv and 17 in May so far, killing two this month, sowing destruction and fear.

Russia has long accused what it calls the "collective West" of staging a proxy war against Moscow by supporting Ukraine with military and financial aid.

Russia launched a full-scale invasion of Ukraine in February 2022, devastating cities, forcing millions of people to flee their homes and costing thousands of lives.

Moscow calls the war a "special military operation" to "denazify" Ukraine and protect Russian speakers. Kyiv and its allies say it is an unprovoked land grab.

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