BANGKOK—The European Union expanded its sanctions against Burma’s military leaders and army-controlled companies ahead of a regional meeting to discuss the worsening crisis after army leaders deposed the elected government. The Council of the European Union’s latest sanctions target 10 individuals and two military-controlled companies already subject to sanctions by the United States, Britain, and other governments. It is unclear if such moves are having any impact as the military escalates its efforts to crush opposition to its seizure of power. Burma’s economy is already in crisis, worsened by the coronavirus pandemic and by the mass civil disobedience movement that arose following the Feb. 1 coup. The EU said the number of individuals sanctioned was expanded to 35 people it said were responsible for undermining democracy and the rule of law, for repressive decisions, and for serious human rights violations. The two military-controlled companies, Myanmar Economic Holdings Public Company Ltd. …