NIGERIA'S oil workers union has asked President Bola Tinubu to deploy more troops, including military chiefs, to combat oil theft and boost output to help Africa's largest economy tackle dollar shortages, an official said. Large-scale oil theft from pipelines and wells has been one of Tinubu's biggest challenges in recent years, damaging government finances and limiting the country's output and exports. Nigeria, Africa's top oil producer, relies on the commodity for more than two-thirds of its earnings and about 90% of foreign exchange income. It has struggled to raise output as theft and sabotage have forced oil majors including Shel…