The US and its allies plan to provide Ukraine with F-16 fighter jets, a White House official has said.

The move comes after US President Joe Biden previously refused requests from Ukrainian leader Volodymyr Zelenskyy for the aircraft.

The timing for when Ukraine will receive the jets – and which countries will provide them – remains unclear, but the official said the planes will not be used for Ukraine’s upcoming counteroffensive against Russia.

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The US and its allies will “decide when to actually provide jets, how many we will provide, and who will provide them”, the official said.

It is understood the F-16s may not necessarily come from the US.

The move is part of a long-term effort to strengthen the country’s security, the official added.

“Discussions about improving the Ukrainian Air Force reflect our long-term commitment to Ukraine’s self-defence,” the senior Biden administration official said.

Mr Biden said in an interview with ABC News in February that US military advice showed Ukraine did not need F-16s at the time.

“I’m ruling it out for now,” he said.

However, Mr Biden informed G7 leaders on Friday that the US will support efforts to train Ukrainian pilots how to fly F-16s.

The effort to train Ukrainian pilots on the jets could start in the coming weeks, the official said.

The training will “take place outside Ukraine at sites in Europe and will require months to complete”, the official added.

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Colin Kahl, the Pentagon’s top policy official, previously told Congress that training Ukrainian pilots on F-16s could take “about 18 months”.

Other US defence officials have said the training could be shortened to only six to nine months based on pilots’ previous training and knowledge of fighter aircraft.

Mr Kahl has previously said that it could cost up to $11bn (£9bn) to revitalise Ukraine’s military with F-16 jets.

G7 leaders have not announced who would pay to provide Ukraine with the planes.

In March, NBC News reported that two Ukrainian pilots were in the US undergoing an assessment to determine how long it could take to train them to fly attack aircraft, including F-16s.

Washington had also approved bringing up to 10 more Ukrainian pilots to the US for further assessment.