Russian President Vladimir Putin vowed retaliation after Ukrainian drones attacked residential buildings in the city of Kazan in Russia’s Tatarstan region.

Putin made the comments via videolink on Sunday while addressing the local leader of Tatarstan in a road-opening ceremony.

“Anyone who tries to destroy, and no matter how great his efforts, he himself will face much greater destruction and will accomplish what he seeks to do in our country,” Putin said.

On Saturday morning, six Ukrainian drones attacked apartment buildings in Kazan and a seventh, a commercial facility. No injuries were officially reported in the attack, while media reported that three other people were isolated by damaged windows.

Videos posted on Russian social media showed drones hitting a high-rise glass construction and launching fireballs; No casualties were reported after the attack.

Kazan is more than 1,000 kilometers (600 miles) from the border with Ukraine. Although Ukraine claimed responsibility for the attack, it is considered a reaction to the Russian missile attack on kyiv.

Putin has in the past threatened to attack central kyiv with a hypersonic ballistic missile in reaction to Ukrainian attacks on Russian territory.

Putin’s risk comes as Russia claims to have advanced on the battlefield in eastern Ukraine.

The Defense Ministry said on Telegram that its troops had “liberated” the villages of Lozova in the northeastern region of Kharkiv and Krasnoye-Sontsivka in Ukraine.

The latter is close to the Kurakhove resource center, which Russia has almost surrounded and which would constitute a key objective in Moscow’s attempt to seize the entire Donetsk region.

Russia has accelerated its advance into eastern Ukraine in recent months, seeking to secure as much territory as possible before U. S. President-elect Donald Trump takes office in January.

The Republican has promised to bring a swift end to the nearly three-year-long conflict, without proposing any concrete terms for a ceasefire or peace deal.

Moscow’s army says it has taken more than 190 Ukrainian settlements this year, and kyiv is struggling to hold the line amid manpower and ammunition shortages.