The Russian military says it thwarted a Ukrainian drone attack, but that one device hit a high-rise tower used by government ministries. It also claims to have repelled an attack on its Black Sea patrols.
Russia says an out-of-control drone hit a business center for a second time. The building houses offices belonging to at least three ministries.
Ministry for Economic Development staff were said to be working remotely while experts weigh up the damage.
Ukraine says the Russian capital is "getting used to a full-fledged war," although Kyiv has not said it was behind the drone attack.
The Russian Defense Ministry also says it foiled a Ukrainian drone attack targeting patrol boats in the Black Sea.
Poland's Ministry of Foreign Affairs called the Ukrainian ambassador to discuss the "comments of representatives of Ukrainian authorities," it said on social media.
It comes after Ukraine's foreign ministry called in Poland's ambassador to Kyiv earlier in the day.
The dispute appears to be over remarks made by Marcin Przydacz, the foreign policy adviser to Poland's president, that Kyiv should show more appreciation for Warsaw's support in its war with Russia (See earlier entry).
Kyiv and Warsaw have been firm allies throughout Russia's war in Ukraine, but the exchanges reflected contentious issues.
