Of the Salvator Mundi of Leonardo da Vinci at Four Marilyns by Andy Warhol. The collection could be in the best museums in the world, but these are not the strengths of a large exhibition in a large gallery, but rather some of the 300 works – more will be added – that have recently been known to belong to Russian citizens who have been sanctioned by the West and have been registered in a database created by the National Agency for the Prevention of Corruption of Ukraine.