This happened in 2019. The Pope in a rare gesture of humility and servanthood knelt down and kissed the feet of South Sudan president Salva Kiir, his main opponent, Riek Machar and three other Vice Presidents in Rome to appeal to them to stop fighting and Respect the peace deal they made in September 2018.
Since the Pope's rare gesture, armed violence has reduced significantly in South Sudan. The UN even confirmed that some provisions of the peace accord have been successfully implemented.
He didn't bow to them, he kissed their feet to appeal to them to end fighting and save lives, as if he was the lowliest of servants among them. That's what Jesus would do.