A spontaneous performance by Russian art-punk band Pussy Riot at the Pinakothek der Moderne museum in Munich lasted just a few minutes before the women were gone again. Their stage was the large staircase in the foyer of the museum, where three members of the group denounced Russian President Vladimir Putin as a war criminal to loud music, in their usual provocative manner. Wearing knitted masks over their faces, they condemned the destructive bombs on Ukraine and called for solidarity with the people there. And they made a special gesture of contempt: one of the women lifted her skirt and uri…