According to King Charles III, he is "full of admiration" for the Ukrainian soldiers being trained in Wiltshire by the British Army.
To help them get ready for battle, about 20,000 Ukrainians will go through a rigorous five-week course.
His Majesty observed the men, who were mainly civilians, storm a mock trench.
Capt Freddie Bradshaw from the 1 Irish Guards stated, "We're trying to teach them how to use the ground to their advantage.".
"They are welcome to use our urban and trench complexes. Given that much of Ukraine is covered in forests, they must learn how to fight there.
The training teams have accumulated a ton of experience here.
"We are trying to make them as lethal as we can in a short period of time - five weeks is a very condensed training package," he said.
The King said to one of the senior officers, "You are amazing, I don't know how you do it," at an undisclosed location in Wiltshire.
I am filled with admiration," he continued.
King Charles spent some time conversing with 20 of the Ukrainians afterward with the aid of a translator.
One of them worked as a mechanic and another as a teacher before joining the army.
"It's an amazing feeling to be in His Majesty's presence," one Ukrainian soldier told the BBC.
"It was the occasion that will cast the brightest light on my life.
He inquired about our health, training, and wives' and husbands' happiness, according to another commenter.
He said, "I feel quick on my feet, and I think it will sink in a few days later.