Career
He previously competed for the Ukraine. Grigorev is from Sumy in the Ukraine. Grigorev competed for Ukraine in short track speed skating at the 2002 Winter Olympics, and the 2006 Torino Winter Olympics.
He did not compete at the 2010 Olympics, and, in 2007, switched allegiance to Russia, due to a shortage of skating facilities in Ukraine.
He qualified to compete for Russia at the 2014 Sochi Winter Olympics.