Polish prosecutors have decided not to take action against individuals who displayed a historical Ukrainian nationalist flag at a recent concert in Warsaw. However, prosecutors have deemed that its display did not violate Poland’s law against promotion of fascist ideologies. Formed during the Second World War, the UPA was a Ukrainian nationalist partisan group that fought for independence. Poland's opposition has submitted a proposed law banning glorification of Ukrainian nationalist leader Stepan Bandera. But he also said that he would propose his own separate new bills banning promotion of Ukrainian nationalist ideology and toughening requirements for foreigners to obtain Polish citizenship, which he did on Monday this week.