sentences:  KazTransOil benefits from low transportation costs and a strong market position in Kazakhstan because of its vast pipeline system.KazTransOil distributes more than 57% of Kazakhstan’s total oil exports.The rating is constrained by significant dependence on Russian pipeline operator OAO AK Transneft (BBB/Stable/--), construction risk related to pipeline capacity expansion projects, an opaque tariff regime and irregular tariff revisions, and operational risk due to aging assets.