The first four Ukrainian pilots are scheduled to complete training on F-16 fighter jets by summer, according to the Arizona National Guard, Report informs, citing CNN.

The pilots began training in mid-October with the 162nd Fighter Wing in Tucson, Arizona. The Pentagon said the training process would take several months to complete.

A second group of another four pilots began training in January, according to Capt. Erin Hannigan, a spokeswoman for the Arizona National Guard, while a third group of four is currently going through English-language training, which is required to fly the fourth-generation US fighter jet.

All of the pilots are expected to complete their training between May and August, said Hannigan, though the exact timeline depends on the progress of the program.

Ukrainian President Volodymyr Zelenskyy requested F-16 fighters for months, believing the advanced US jets would be able to challenge Russia's aerial power over the battlefield.