Question: Did Russian mathematician Yuri Manin or Efim Zelmanov win the Fields Medal of International Congress of Mathematicians in 1994?
Context: In mathematics, in the field of arithmetic algebraic geometry, the Manin obstruction (named after Yuri Manin) is attached to a variety "X" over a global field, which measures the failure of the Hasse principle for "X".  If the value of the obstruction is non-trivial, then "X" may have points over all local fields but not over the global field. In mathematics, Manin matrices, named after Yuri Manin who introduced them around 1987–88, are a class of matrices with elements in a not-necessarily commutative ring, which in a certain sense behave like matrices whose elements commute.  In particular there is natural definition of the determinant for them and most linear algebra theorems like Cramer's rule, Cayley–Hamilton theorem, etc. hold true for them.  Any matrix with commuting elements is a Manin matrix.  These matrices have applications in representation theory in particular to Capelli's identity, Yangian and quantum integrable systems. John Charles Fields, FRS, FRSC (May 14, 1863 – August 9, 1932) was a Canadian mathematician and the founder of the Fields Medal for outstanding achievement in mathematics.  First awarded in 1936, the medal has been awarded since 1950 every four years at the International Congress of Mathematicians to two, three or four recipients under the age of 40. The Fields Medal Symposium is an annual event that honours one of the Fields Medal recipients from the most recent International Congress of Mathematicians.  The symposium is jointly endorsed by the International Mathematical Union and the Fields Institute for Mathematical Sciences.  The idea was conceived in preparation for the International Congress of Mathematicians 2010 (ICM2010) in Hyberdad, India.  Professor Edward Bierstone of the University of Toronto was the director of the institute during the inaugural symposium in October 2012.  All symposiums take place at the Fields Institute in Toronto, Canada.  The symposia include mathematical activity that explore work related to the honoured Fields Medallist.  They will include public lectures meant to spark interest in mathematics including public lectures and events for students. Efim Isaakovich Zelmanov (Russian: Ефи́м Исаа́кович Зе́льманов ; born 7 September 1955 in Khabarovsk) is a Russian-American mathematician, known for his work on combinatorial problems in nonassociative algebra and group theory, including his solution of the restricted Burnside problem.  He was awarded a Fields Medal at the International Congress of Mathematicians in Zürich in 1994. Vladimir Leonidovich Popov (Russian: Влади́мир Леони́дович Попо́в ; born 3 September 1946) is a Russian mathematician working in the invariant theory and the theory of transformation groups.  He is a member of the Steklov Institute of Mathematics and a professor of the National Research University – Higher School of Economics.  In 1986, he was an invited speaker at the International Congress of Mathematicians (Berkeley, USA), and in 2008–2010 he was a core member of the panel for Section 2, "Algebra" of the Program Committee for the 2010 International Congress of Mathematicians (Hyderabad, India). Konstantin "Kostya" Mikhailovich Khanin (Russian: Константин Михайлович Ханин ) is a Russian mathematician and physicist.  Khanin received his PhD from the Landau Institute of Theoretical Physics in Moscow and continued working there as a research associate until 1994.  Afterwards, he taught at Princeton University, at the Isaac Newton Institute in Cambridge, and at Heriot-Watt University before joining the faculty at the University of Toronto.  Khanin was an invited speaker at the European Congress of Mathematics in Barcelona in 2000.  He was a 2013 Simons Foundation Fellow.  He held the Jean-Morlet Chair at the Centre International de Rencontres Mathématiques in 2017, and he is an Invited Speaker at the International Congress of Mathematicians in 2018 in Rio de Janeiro. Wendelin Werner (born 23 September 1968) is a French mathematician working on random processes such as self-avoiding random walks, Brownian motion, Schramm–Loewner evolution, and related theories in probability theory and mathematical physics.  In 2006, at the 25th International Congress of Mathematicians in Madrid, Spain he received the Fields Medal "for his contributions to the development of stochastic Loewner evolution, the geometry of two-dimensional Brownian motion, and conformal field theory".  He is professor at ETH Zürich. The Fields Medal is a prize awarded to two, three, or four mathematicians under 40 years of age at the International Congress of the International Mathematical Union (IMU), a meeting that takes place every four years. Yuri Ivanovitch Manin (Russian: Ю́рий Ива́нович Ма́нин ; born 1937) is a Soviet/Russian/German mathematician, known for work in algebraic geometry and diophantine geometry, and many expository works ranging from mathematical logic to theoretical physics.  Moreover, Manin was one of the first to propose the idea of a quantum computer in 1980 with his book "Computable and Uncomputable".
Answer: Efim Isaakovich Zelmanov