According to whom was Yuri Izrael the  "most influential scientific adviser" to the current President of Russia?
Yuri Izrael: Yuri Antonovich Izrael (Russian: Юрий Антониевич Израэль ; 15 May 1930, Tashkent – 23 January 2014, Moscow) was a vice-chairman of the Intergovernmental Panel on Climate Change (IPCC) until September 2008, when the new bureau was elected. Yuri Izrael:  He was the "most influential scientific adviser" for Vladimir Putin, the former president of Russia, according to CNN. 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.
i don't know