The crash on Wednesday came as Ukraine said its forces again blunted Russian attempts to advance on the frontline city of Bakhmut hundreds of kilometres away in the east, where both sides have taken heavy losses for scant gain in trench warfare since November.

Ukrainian officials said it was too early to determine what caused the helicopter crash.

None spoke of an attack by Russian forces raging war in Ukraine.

Dozens of people were injured, including children, many suffering burns after the French-made Super Puma helicopter went down in the fog in Brovary on the eastern outskirts of Kyiv, plummeting into the nursery grounds.

Ukrainian state emergency services said 14 people had been killed. Government agencies had earlier published higher death tolls ranging up to 18.

Interior Minister Denys Monastyrskyi, who was on board the helicopter, was among the dead. He was the most senior Ukrainian official to die since the war began.

Since Ukraine wrested back significant territory in the east and south in the second half of 2022, front lines have hardened and Kyiv says new Western weapons especially heavy battle tanks are vital for it to regain momentum this year.

Western allies will gather at a United States air base in Germany on Friday to offer more weapons for Ukraine.

Attention is focused in particular on Germany, which has veto power over any decision to send its Leopard tanks, fielded by NATO-allied armies across Europe and widely seen as the most suitable for Ukraine.

Germany won’t allow allies to ship German-made tanks to Ukraine to help its defence against Russia or send its own systems unless the US agrees to send its own tanks, the Wall Street Journal reported on Wednesday, citing senior German officials.

Residents at the scene of the helicopter crash described a frantic rescue.

“We saw wounded people, we saw children. There was a lot of fog here. Everything was strewn all around. We could hear screams. We ran towards them,” Hlib, a 17-year-old local resident, told Reuters.

“We took the children and passed them over the fence, away from the nursery as it was on fire.”

The entire side of the nursery building was charred, with a gaping hole above the entrance, where the helicopter’s rotor blades rested.

Nearby, debris was strewn across a muddy playground and the helicopter wreckage lay crumpled by an apartment block.

Vitaliy, 56, said he saw the aircraft fall quickly and crash onto the grounds of the nursery before debris was hurled further into the block of flats.

“I thought it was the engine from a rocket,” he said.

President Volodymyr Zelenskiy ordered an investigation into what he said was a “terrible tragedy”.

“The pain is unspeakable,” he said in a statement.

Monastyrskyi died alongside his first deputy, Yevheniy Yenin, and other ministry officials flying in the helicopter operated by the state emergency service.

Ukraine’s SBU State Security Service said it would consider possible causes, including a breach of flight rules, a technical malfunction or intentional destruction.

Western leaders sent condolences and paid tribute to Monastyrskyi, 42, a lawyer and lawmaker.

US President Joe Biden voiced condolences to the families of the crash victims and said the US would honour Monastyrskyi with a continued commitment to preserving Ukraine’s democracy.

In a speech by video link to the World Economic Forum (WEF) in Davos, Switzerland, Zelenskiy said Western supplies of tanks and air defence systems to ward off Russia’s missile strike campaign should come more quickly and be delivered faster than Moscow is able to carry out attacks.

“The supplying of Ukraine with air defence systems must outpace Russia’s next missile attacks,” he said.

“The supplies of Western tanks must outpace another invasion of Russian tanks.”