Question: According to whom was Yuri Izrael the  "most influential scientific adviser" to the current President of Russia?
Sentence (from "Vladimir Putin"): Vladimir Vladimirovich Putin ( ; Russian: Влади́мир Влади́мирович Пу́тин ; ] ; born 7 October 1952) is the current President of Russia, holding the office since 7 May 2012.
Relevant evidence: Yes