Oil buyers in Asia are demanding deep discounts on Venezuelan crude due to a flood of sanctioned oil from Russia and Iran on offer and to heightened risk of loading in the South American country as the U.S. boosts its military presence in the Caribbean, traders and other sources said. President Donald Trump said on Wednesday that American authorities seized a tanker connected to Venezuela oil shipments. Venezuela has managed to increase oil exports this year from 2024 volumes even as Washington has ratcheted up pressure on President Nicolas Maduro.