Moscow is aware that the Baltic states have allowed Ukraine to use their airspace for drone strikes targeting north-western Russia, Russian Deputy Foreign Minister Sergey Galuzin has said.

Kiev has been ramping up its long-range UAV attacks on energy infrastructure in Russia’s Leningrad Region, which surrounds the country’s second-largest city, St. Petersburg, since spring. There have been a number of incidents where explosive-laden drones crashed in nearby NATO member states – Latvia, Lithuania and Estonia – while on their way to Russia in recent months.

Leningrad Region witnessed its latest major Ukrainian drone attack in the early hours on Saturday; at least 72 UAVs were shot down by air defenses, according to local governor Aleksandr Drozdenko.

On the same day, Galuzin told RIA Novosti that the Russian authorities “have verified data indicating that Latvia and other Baltic republics have already provided air corridors for Ukrainian drones that have attacked our country’s civilian infrastructure.”

The Baltic nations and Finland, which have been among the staunchest backers of Kiev in the EU during the Ukraine crisis, had previously denied any involvement in the drone attacks on Russia.

In May, the ruling coalition in Latvia collapsed over the slow military response to Ukrainian drones. Finnish Prime Minister Petteri Orpo claimed that he had challenged Ukraine’s Vladimir Zelensky on the issue in-person during their meeting in Armenia the same month, calling the aerial incursions “unacceptable.” Estonia had also reported intercepting several UAVs over its territory.

However, Estonian Foreign Minister Margus Tsahkna said on Monday that Tallinn will accept Ukrainian drones violating its airspace as long as they are causing damage to Russia. “Of course we are not happy about [the UAV incursions]. But we are not saying to Ukraine to stop it,” he told the Financial Times.

Russian Security Council Secretary Sergey Shoigu has warned previously that if it turns out that the Baltic states and Finland “deliberately provide their airspace” to Ukrainian UAVs, Moscow has the right to self-defense in response to an “armed attack” under Article 51 of the UN Charter.