Vladimir Sergeyevich Solovyov[a] (Russian: Влади́мир Серге́евич Соловьёв; January 28 [O.S. January 16] 1853 – August 13 [O.S. July 31] 1900) was a Russian philosopher, theologian, poet, pamphleteer, and literary critic. wiki His work (along with that of Nikolai Berdyaev and Ivan Ilyin) is being popularised by Vladimir Putin. 
- Paul Marshall Allen, Vladimir Soloviev: Russian Mystic (1968).
- Jonathan Sutton, The Religious Philosophy of Vladimir Solovyov: Towards a Reassessment (Basingstoke, UK: Macmillan, 1988).