Nikolay Mitrofanovich Krylov (Russian: Никола́й Митрофа́нович Крыло́в , Ukrainian: Микола Митрофанович Крилов ) (29 November [O.S. 17 November] 1879 – May 11, 1955) was a Russian and Soviet mathematician known for works on interpolation, non-linear mechanics, and numerical methods for solving equations of mathematical physics.
Alexander Ivanovich Polezhayev (Russian: Алекса́ндр Ива́нович Полежа́ев , 11 September [o.s. 30 August] 1804, v.Pokryshkino, Penza Governorate, Russian Empire – 28 [o.s. 16] January 1838, Moscow, Russian Empire), was a controversial Russian poet, best known for his satirical poem "Sashka" which in 1826 resulted in his being demoted to the Russian Army in the Caucasus, by a special decree of Nicolas I who saw this daring challenge as a continuation of the Decembrist revolt.
 Polezhayev continued to write satires (describing the Russian Tsar as 'a hangman' and 'an Emperor corporal') and in the early 1830s became close to the radicals, one of whom, Alexander Hertzen, later remembered him with great warmth in his book of memoirs "My Past and Thoughts".
 A volatile and rebellious character prone to heavy drinking, Polezhayev got involved in a series of incidents, the last of which resulted in his being punished by flogging so severe, fragments of twigs had to be extracted surgically form his back.
 After that, in the course of several months, Alexander Polezhayev fell ill with tuberculosis and died.
In control systems theory, the describing function (DF) method, developed by Nikolay Mitrofanovich Krylov and Nikolay Bogoliubov in the 1930s, and extended by Ralph Kochenburger is an approximate procedure for analyzing certain nonlinear control problems.
 It is based on quasi-linearization, which is the approximation of the non-linear system under investigation by a linear time-invariant (LTI) transfer function that depends on the amplitude of the input waveform.
 By definition, a transfer function of a true LTI system cannot depend on the amplitude of the input function because an LTI system is linear.
 Thus, this dependence on amplitude generates a family of linear systems that are combined in an attempt to capture salient features of the non-linear system behavior.
 The describing function is one of the few widely applicable methods for designing nonlinear systems, and is very widely used as a standard mathematical tool for analyzing limit cycles in closed-loop controllers, such as industrial process controls, servomechanisms, and electronic oscillators.
Nikolay Mikhailovich Mikhailov was born in 1932 in the village Usa in the Bashkir ASSR.
 In 1945, he studied at the Moscow Military Music College.
 Being a cadet at the college, he took part in the Moscow Victory Parade of 1945 as a drummer of the school.
 In 1950 he graduated from the school and studied at the Institute of Military Conductors.
 From 1965 to 1970 he was the senior director of the central orchestra of the Volga Military District.
 In 1975, Mikhailov was appointed deputy chief of the Moscow State Conservatory.
 In 1976, Mikhailov was appointed Chief Conductor Central Military Band of the Ministry of Defense of the USSR and Chief Conductor Military Band Service of the Armed Forces of the Soviet Union.
 He commanded the massed bands during Victory Parades and Revolution Day Parades for 14 years from 1976 to 1990.
 He was released from this post in early 1993.
 He died in Moscow on October 22, 2006.
 He was buried in Vostryakovskoe Cemetery.
Nicolai Vladimirovich Krylov (Russian: Никола́й Влади́мирович Крыло́в ; born 5 June 1941) is a Russian mathematician specializing in partial differential equations, particularly stochastic partial differential equations and diffusion processes.
 Krylov studied at Lomonosov University, where he in 1966 under E. B. Dynkin attained a doctoral candidate title (similar to a PhD) and in 1973 a Russian doctoral degree (somewhat more prestigious than a PhD).
 He taught from 1966 to 1990 at the Lomonosov University and is since 1990 a professor at the University of Minnesota.
 At the beginning of his career (starting from 1963) he, in collaboration with Dynkin, worked on nonlinear stochastic control theory, making advances in the study of convex, nonlinear partial equations of 2nd order ("i.e." Bellman equations), which were examined with stochastic methods.
 This led to the Evans-Krylov theory, for which he received with Lawrence C. Evans in 2004 the Leroy P. Steele Prize of the American Mathematical Society (for work done simultaneously and independently by both Krylov and Evans).
 They proved the second order differentiability (Hölder continuity of the second derivative) of the solutions of convex, completely nonlinear, second order elliptical partial differential equations and thus the existence of "classical solutions" (Theorem of Evans-Krylov).
 He was in 1978 at Helsinki and in 1986 at Berkeley an Invited Speaker for the ICM.
 He received the Humboldt Research Award in 2001.
 In 1993 he was elected a member of the American Academy of Arts and Sciences (1993).
 He should not be confused with the mathematician Nikolay M. Krylov.
Alexander Ivanovich Medvedev (Russian: Александр Иванович Медведев; "Aleksandr Ivanovich Medvedev" ) (born 14 August 1955 in Shakhtyorsk, Sakhalin Oblast) is the current Deputy Chairman of the Management Committee of Russian energy company Gazprom.
 Medvedev also served as Director-General of Gazprom's export arm Gazprom Export from 2006 until 2014.
 He is a member of the Coordination Committee of RosUkrEnergo and a member of the shareholders' committee of Nord Stream AG, and was the first president of the Kontinental Hockey League (KHL), serving from 2008 until his resignation in 2014.
The Krylov–Bogolyubov averaging method (Krylov–Bogolyubov method of averaging) is a mathematical method for approximate analysis of oscillating processes in non-linear mechanics.
 The method is based on the averaging principle when the exact differential equation of the motion is replaced by its averaged version.
 The method is named after Nikolay Krylov and Nikolay Bogoliubov.
In mathematics, the Krylov–Bogolyubov theorem (also known as the existence of invariant measures theorem) may refer to either of the two related fundamental theorems within the theory of dynamical systems.
 The theorems guarantee the existence of invariant measures for certain "nice" maps defined on "nice" spaces and were named after Russian-Ukrainian mathematicians and theoretical physicists Nikolay Krylov and Nikolay Bogolyubov who proved the theorems.
Alexander Ivanovich Mikhailov, or A. I. Mikhailov ( December 6, 1905, Russian Empire – February 6, 1988, Moscow) was a Russian/Soviet Engineer and Information Scientist.
 He was one of the most influential thinkers related to the field of Information Science in the Soviet Union and the Eastern bloc.
Alexander Ivanovich Marinesko (Russian: Александр Иванович Маринеско , Ukrainian: Олександр Iванович Марiнеско , "Aleksandr Ivanovich Marinesko", "Alexander Marinesco"; Romanian: "Alexandru Marinescu" ) (15 January 1913 – 25 November 1963) was a Soviet naval officer and, during World War II, the captain of the S-13 submarine that sank the German refugee transport ship "Wilhelm Gustloff".
 The most successful Soviet submarine commander in terms of gross register tonnage (GRT) sunk, with 42,000 GRT to his name, he was posthumously awarded the title Hero of the Soviet Union, the highest distinction in the Soviet Union.

Question: Are Alexander Ivanovich Mikhailov and Nikolay Mitrofanovich Krylov both Russian?
Answer: yes