The United States and its allies are planning to provide Ukraine with F-16 fighter jets, the White House has said.

The timing for when Ukraine will receive the aircraft, how many will be delivered, and which countries will provide them remains unclear, but an official stressed they will not be used for an upcoming counteroffensive against Russia.

This comes as Ukrainian President, Volodymyr Zelenskyy, arrived in Japan for talks with G7 leaders.

Zelenskyy met with British Prime Minister, Rishi Sunak, at the summit.

The prime minister said: “You made it.”

Asked if it was a good day, the Ukrainian President smiled, nodded, and said: “Thank you.”

United States President, Joe Biden, has also endorsed the training of Ukrainian pilots to fly F-16s, according to officials.

Until now, he had refused Zelenskyy’s requests for the F-16 fighter jets.

But speaking on the fringes of the G7 summit in Japan, White House national security adviser, Jake Sullivan, said Western assistance to Ukraine needed to change as the conflict changed.

“As the training unfolds in the coming months, we will work with our allies to determine when planes will be delivered, who will be delivering them, and how many,” he added.

Zelenskyy and Biden are now set to hold face-to-face talks over the weekend at the G7 summit.

Japan’s foreign ministry announced he would arrive on Sunday to meet with Prime Minister Fumio Kishida, and America’s national security chief said a Zelenskyy-Biden summit was also a “safe bet”.

The provision of F-16s is a long-awaited win for Zelenskyy, who has regularly called on Western allies to provide powerful aircraft to his troops.

On a visit to London, he even presented Commons Speaker Sir Lindsay Hoyle with a Ukrainian air force helmet to reinforce his point.

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Western leaders have argued that training on the aircraft would take too long.

It would also be some of the most sophisticated hardware provided for Ukraine, raising the stakes between Russia and the West.

It is understood the F-16 fighter jets may not necessarily come from the US, but the move is part of a long-term effort to strengthen Ukraine’s security, a White House official said.

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

Efforts to train Ukrainian pilots on the jets could start at sites in Europe in the coming weeks, and will take months.

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 U.S. 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 U.S. for further assessment.

The F-16 Fighting Falcon is a multi-role fighter aircraft developed for the United States Air Force.

It has an internal M61 Vulcan cannon and 11 locations for mounting weapons and other equipment.

Its payload typically consists of two 2,000lb (907kg) bombs, two AIM-9 Sidewinder short-range air-to-air missiles, two AIM-120 medium-range air-to-air missiles and two 2,400lb (1088kg) external fuel tanks.

The F-16 fighter jet can travel at speeds up to 1,500mph and has a range of more than 2,002 miles.

It has a wingspan of 32ft 8in (9.9m) and a length of 49ft 5in (13.8m).

It weighs 19,700lb (8935kg) without fuel and has a maximum takeoff weight of 37,500lb (17010kg).

There is both a single-seat and two-seat model of the aircraft.

During the Gulf War in 1991, F-16s were used to attack airfields, military production facilities, Scud missile sites and other targets.

They were also used in the NATO bombing of military infrastructure in former Yugoslavia in 1999, as well as in Iraq and Afghanistan.

The F-16 fighter jets are operated by several countries other than the U.S., including Poland, Belgium, the Netherlands, and Denmark.

The Star