Banksy posted a photo of the mural - a girl gymnast performing a handstand on a small pile of concrete rubble - on Instagram late on Friday. The work was painted onto the wall of a building destroyed by shelling.
At least one other piece of new graffiti in Banksy's signature style, although not posted by the mercurial artist on social media, was spotted in Borodyanka, portraying a man being flipped in judo by a much smaller child.
Several curious onlookers came to see the artwork, some of whom had made the 60 km drive from Ukraine's capital city, Kyiv.
"This is such a historic moment for our country, that people like Banksy and other famous figures are coming here and showing the world what Russia has done to us," said one of the visiting Kyivans, 31-year-old Alina Mazur.