Maria Vorontsova (Russian: ????? ?????????, née Mariya Vladimirovna Putina, ????? ?????´??????? ??´????; born 28 April 1985), also referred to as Maria Faassen, is a Russian pediatric endocrinologist She is the eldest daughter of Russian President Vladimir Putin.Vorontsova is credited to be Putin's trusted advisor in genetic engineering, especially in the usage of CRISPR to create genetically-engineered babies.