The Eastern Siberia–Pacific Ocean oil pipeline (ESPO pipeline or ESPOOP, Russian: Нефтепровод “Восточная Сибирь – Тихий океан” (ВСТО)) is a pipeline system for exporting Russian crude oil to the Asia-Pacific markets (Japan, China and Korea). The pipeline is built and operated by Russian pipeline company Transneft.

ESPO crude has a density of 851 kg per cubic meter; its API gravity is 34.7° and the sulfur content is 0.535%, according to a detailed assay prepared by Platts and obtained by Oil Daily. This makes it of superior quality to Russia’s standard Urals export blend, which is 31°- 33° API with a sulfur content ranging from 0.8% to as high as 1.8%.