United Nations investigators on Tuesday unveiled rampant and systemic corruption by South Sudan’s ruling class, compounding the country’s security challenges and putting the pivotal oil-driven economy at severe risk. The global agency has accused South Sudanese authorities of plundering the country’s wealth, including bogus payments totaling $1.7 billion in the 2021-2024 period to companies linked with Vice President Benjamin Bol Mel for road construction contracts that were never delivered. The 101-page report uncovers how South…