Tretyakov museum may invite foreign experts to conduct further research on the radical work

Fundació Gaspar will host a major exhibition of works by Paul McCarthy in 2016

Feminist art activists plan “anti-billionaire” campaign to highlight discrimination, which kicks off in Minneapolis

Mould flourished, floors buckled and ceilings leaked in the two buildings that housed the museum's permanent collection when it announced $34m renovation in 2009 at the height of the recession

The British Museum and British Library will contribute to events across the country

Artist, architect and critic among those killed by terrorists

Arts patron John Kaldor helps bring six-hour performance to Sydney

City’s outspoken mayor is backing the biennial, which could transform the island’s identity

Non-profit gallery has turned to artists as "philanthropic community has become less supportive"

Leading directors oppose Cimam president at centre of censorship row in Barcelona

John Martin and Everard Read galleries opened Circa London this week

The Abolitionists to include controversial installation about Michael Brown shooting by artist Ti-Rock Moore

Zurab Tsereteli says he has been approached to design a monument in St Petersburg and will do it for free

Petr Pavlensky has been taken into custody by police for his latest piece protesting state surveillance

Culture bus heads to Washington in bid to change attitudes to the Middle East

New framework stresses return principle but some fear that traffickers in illicit objects could abuse it

Greta Moll’s heirs argue painting was “misappropriated” in 1947

Antonello da Messina’s triptych brought together in 15-year loan agreement

Boris Johnson says Smithsonian Institution still on board as capital’s planned cultural quarter on former Olympics site gets £45m in donations

Austrian collector previously supported Frieze Projects with her prize

Participants, including Douglas Coupland, invest in a simulated stock market shaped by technological developments

Proposal is one of three being considered by Southwark Council in south London next week

Artists’ foundation takes over former factory that served as Otto Piene’s fire studio—and party centre

Renovation of the Pergamon Museum expected to be complete by 2019, with a new wing dedicated to Egyptian art to open by 2026

Artist links delayed arrival of Event Horizon with pro-democracy movement and taboo subject of suicide

Yayoi Kusama and Random International are latest victims of China’s copycats

Full-scale re-creation is part of ambitious new display of masterpieces at Museo dell’Opera del Duomo