Abu Dhabi: More than 100 high-profile artists and curators have backed an online petition in protest at working conditions for labourers building the Guggenheim Abu Dhabi on Saadiyat Island. Artists including Mona Hatoum and Shirin Neshat say they will not display their work in the museum because of “human rights violations”.

Australia: The Art Gallery of New South Wales in Sydney will open a 3,300sq m space this month to display the modern and contemporary art holdings of the Hungarian-born Australian collector John Kaldor. The collection, which consists of more than 200 works with an estimated value of A$35m, includes works by Robert Rauschenberg and Sol LeWitt.

China: High-profile artist Ai Weiwei was arrested by Chinese authorities last month at Beijing airport as he was about to board a plane to Hong Kong. Tate released a statement saying it was “dismayed by developments that again threaten Weiwei’s right to speak freely as an artist and hope that he will be released immediately”.

France: Iran has cut ties with the Louvre, saying that the Paris museum has failed to honour a 2004 cultural cooperation agreement to set up an exhibition of Persian artefacts in Iran.

Japan: An exhibition of more than 80 major impressionist works at the Hiroshima Prefectural Art Museum was delayed last month because of concerns over the Fukushima nuclear power plant disaster. About 50 of the works are on loan from French museums, and the country’s ministry of culture halted the show.

US: A $4.2bn subway line planned for Los Angeles, with exits outside the Museum of Contemporary Art, Natural History Museum and Los Angeles County Museum of Art, is set to be completed by 2022. Meanwhile, more than 60 cultural institutions from southern California are joining forces this October to create Pacific Standard Time: Art in L.A. 1945-1980, a six-month project reflecting the rise of LA’s arts scene.

US: The Russian government has demanded that 37 works on loan from Moscow’s Andrei Rublev Museum to the Museum of Russian Icons in Massachusetts are returned to Russia. The objects were on display in the exhibition Treasures from Moscow, which runs until 25 July. Gordon Lankton, the museum’s founder, said the decision was linked to a legal dispute involving the return of a Jewish archive from Russia to the US.

Seen in the Art Newspaper, Chunichi Shimbun, Guardian and Agence France Presse