Ukranian President Volodymyr Zelenskyy invited Bono and the Edge to perform in Kyiv as a show of solidarity with the Ukrainian people. They took Zelenskyy's offer and played their hearts out in a bomb shelter in Kyiv. I think it was a smart tactical move by Zelenskyy. Included a link to more info. Cheers!
https://www.npr.org/2022/05/10/1097904616/u2-bono-kyiv-subway-concert