[2] He did not compete at the 2010 Olympics,[4] and, in 2007, switched allegiance to Russia, due to a shortage of skating facilities in Ukraine.

On 15 February 2014, he won a silver medal in the 1000m short track speedskating event, as part of the first Russian 1-2 finish in short track, with Viktor Ahn winning gold.

With his silver, at 31 years and 191 days of age, Grigorev became the oldest man to win a short track Olympic medal.

[5] On 21 February 2014, he won a gold medal in 5000m-relay as part of Team Russia.

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