Protest over Denmark for hosting Chechen conference

The video discusses the protest against the World Chechen Congress held in Denmark on Russia's day of mourning, which is seen as unfriendly by the Russian state. It also emphasizes the demand for the extradition of Zakayev to face Russian justice.

What event coincided with the protest mentioned in the text?

Who is the criminal that the speaker insists should be handed over to Russian justice?