A spokeswoman for London's Tate Modern gallery said the gallery was "pleased" with today's court decision.
Wlodzimierz Umaniec has been jailed for two years for defacing a painting by artist Mark Rothko.
Tate is pleased that the court has recognised the severity of this incident and its consequences when sentencing Wlodzimierz Umaniec to two years in prison.
More top news
A man caught with dozens of turtles inside his pants is to face a court under the US justice system.
Too many family homes are being built around the size of a bathroom too small for people to live in them comfortably, a report says.
The numbers of female officers in police forces must be boosted further as they tackle the "changing face of crime", Theresa May will say.