Russia launched a record 90 Shahed-type drones across Ukraine during the early hours of the new year – and Russian President Vladimir Putin said his country will “intensify” its attacks on its neighbour.

Speaking during a New Year’s Day visit to a military hospital, Mr Putin said Ukraine can expect more strikes after shelling of the Russian border city of Belgorod which killed more than two dozen people and wounded more than 100 others.

“They want to intimidate us and create uncertainty within our country. We will intensify strikes. Not a single crime against our civilian population will go unpunished,” the Russian leader said, describing the barrage of Belgorod as a “terrorist act”.

Russia has blamed Ukraine for Saturday’s attack, which was one of the deadliest to take place on Russian soil since Moscow’s full-scale invasion of Ukraine started more than 22 months ago.

The death toll stood at 25 as of Monday, Russian officials said.

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A building on fire after a Russian drone attack on Dubliany in the Lviv region of Ukraine (Ukrainian Emergency Service/AP)

Cities across western Russia have regularly come under drone attacks since May, although Ukrainian officials never acknowledge responsibility for strikes on Russian territory or the Crimean Peninsula.

Mr Putin accused western nations of using Ukraine to try and “put Russia in its place”.

While vowing retribution, he insisted Russia will only target military infrastructure in Ukraine.

“Of course, we can hit public squares in Kyiv and in any other Ukrainian city,” he said.

“I understand — I’m boiling with rage — but do we need to hit civilians? No. We are hitting military targets and that’s what we will keep doing.”

The wave of drone attacks in Ukraine continued throughout Monday.

A 15-year-old boy was killed and seven people were hurt after falling debris from one of 87 downed drones hit a residential building in the southern Ukrainian city of Odesa, the head of the region’s military administration, Oleh Kiper, said.

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Damage to a university building in Dubliany caused by a Russian drone attack (Ukrainian Emergency Service/AP)

Debris also sparked a number of small fires, including at the city’s port.

In the western city of Lviv, Russian attacks severely damaged a museum dedicated to Roman Shukhevych, a controversial Ukrainian nationalist and military commander who fought for Ukrainian independence during the Second World War.

University buildings in the town of Dubliany were also damaged, although no casualties were reported.

Writing on social media, Lviv mayor Andriy Sadovyi described the strike as “symbolic and cynical”, adding: “This is a war for our history.”

Meanwhile, four people were killed and 13 more wounded following Ukrainian shelling on Russian-occupied areas of Donetsk, according to the region’s Kremlin-installed leader, Denis Pushilin.

Russian state media said a journalist was among the victims but provided no further details.

One person was also killed and another wounded in shelling on the Russian border town of Shebekino, regional governor Vyacheslav Gladkov said.