The robotic dogs were first seen at Art Basel in Miami.
Dozens of miniature mosaics have been installed in Portland by an anonymous group of artists.
Gunnar Sachs, whose father, Gunter, was married to the actress for three years in the 60s, recounts their relationship and how Warhol's portrait of her came about ahead of its sale at Sotheby's New York in May.
Ukraine has imposed sanctions on Russian pavilion comissioner Anastasia Karneeva, former culture minister Mikhail Shvydkoy, and artists Artem Nikolaev, Ilya Tatakov and Valeria Oliinyk.
The economist Clare McAndrew reflects on a decade of research for the Art Basel & UBS report and the profound structural and geographical transformations shaping the global contemporary art market.
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