Nato allies the Netherlands and Denmark are leading an international coalition to train pilots and support staff, maintain aircraft and ultimately supply F-16s to Ukraine.
Previously, the Netherlands had said it aimed to start training Ukrainian pilots "as soon as possible", but had stopped short of specifying when such training could get underway.
"This summer is our ambition, and we'll see if that's realistic" for the start of the training programme, Dutch Defence Minister Kajsa Ollongren told Reuters in an interview on Thursday (June 8).
She said the aim would be to have the training programme fully operational within six months.
Denmark, where there are flight simulators, is a possible location to host the programme.
A final decision has not yet been taken on a request from Kyiv to supply dozens of F-16s, Ollongren said.
The US-backed training programme will include Belgium and Luxembourg, while France and Britain have offered assistance, she said.
Two sources, speaking on condition of anonymity, told Reuters the training would begin with two groups of 12 Ukrainian pilots, already experienced flying Soviet-era MiGs.
The minister did not specify the initial size of the programme.
Ukraine's President Volodymyr Zelenskiy said last week he received "a serious, powerful" offer from leaders of countries ready to provide Kyiv with F-16 fighter jets and is awaiting final agreements with key allies.
The Netherlands, like other Nato members, is transitioning to newer F-35 fighters.
The Dutch still have 24 F-16s in operation and more out of service which could be transferred to Ukraine.
It usually takes roughly 2.5 years to become a fighter pilot in the Netherlands.
A US official, speaking to Reuters on condition of anonymity, said estimates on the training time are still being finalised, but that it could take as little as four months to teach basic F-16 skills to an experienced Ukrainian pilot.
Colonel Laurens-Jan Vijge, a Dutch F-35 pilot who flew F-16s for 15 years, including multiple missions to Afghanistan, is part of the team being assembled to train the Ukrainians.
"Flying-wise, well, technically, if you're a pilot, this is also just an airplane," he told Reuters at the Volkel air base in the southern Netherlands, the roar of landing F-35 jets in the background.
Ukrainian pilots would have to learn how to operate the F-16's so-called "hands-on throttle and stick," a system particular to Western aircraft that differs from most of those used in former Soviet states.
The course will include language training and simulator training, he said.
Reuters