Claims centre on five paintings bought by Chinese businessman Yikun Zhang for a combined $60,000 in a charity sale held by the country’s Labour Party in 2017

Femme nue couchée was shown in Tate blockbuster exhibition in 2018

Christie's Paris will offer the posthumous cast of the famous bronze at auction in June

From the $200m Warhol Marilyn at Christie's to the second part of the Macklowe sale at Sotheby’s, the May auctions in New York will be bigger than ever—against the odds

Formerly attributed to “the school of Michelangelo”, experts now say the nude sketch is by the master's own hand

The sale at Sotheby's New York in May will coincide with the delayed opening of the controversial exhibition Philip Guston Now in Boston

Plus, an exhibition about wartime hideouts in Poland and Ukraine, and Mondrian’s final work Victory Boogie Woogie

Vincent writes philosophically about his mental illness, a year after mutilating his ear

Our pick of the highlights from April's fairs and auctions

The French museum is now seeking funds to buy the still-life painting, which was sold last week by Artcurial to a US dealer for €24.3m

Only two of the 12 works have been guaranteed, an oddity in the recent string of high-profile single-owner sales

Asian spending continues to grow, particularly at auction, while the UK’s market share shrinks to historic lows as Brexit woes linger

The artefacts were flagged by Christos Tsiogiannis, who has, since 2006, been identifying looted antiquities through photographic archives of suspected and convicted dealers in plunder

The New York dealer Adam Williams bought the fruity still-life

The French conceptual artist made nine "empty zones" in the last three years of his life, which could be purchased only with pure gold

The firm bags a second Scandinavian auction house as sector consolidation continues

The painting, being sold by the Thomas and Doris Ammann Foundation, could become the most expensive 20th century work of art ever sold at auction when it is offered in New York in May

The 19th-century work, executed just before the sculptor's death, has been rediscovered after languishing outside for more than 50 years

The 25-lot sale tomorrow includes works that reflect "how irrational, how ugly, and how challenging the modern world can be"

The sale of the canonical early Cubist sculpture will bolster the museum’s acquisitions fund and at no great cost to its collection, which includes another edition of the work

Phillips will sell 16 works in aid of the London University institution tomorrow

The sprawling 20th and 21st century sale took over five hours and spanned Boudin to Banksy

Christie’s is to offer the never-exhibited painting in a New York auction in May

The works, by artists such as Warhol, Richter and Giacometti, will be sold in New York in May

Portrait of a Lady by the artist and his workshop is expected to sell for up to £4m at DesaUnicum in Warsaw next month

Proceeds from the auctions, at Deutscher and Hackett and Leonard Joel, have been earmarked for climate change programme, but questions arise over bank's motivations

Sotheby’s will auction the surviving picture of the strolling couple on 2 March, estimated at £7m-£10m

Our pick of the highlights from upcoming fairs and auctions

The painting, sold last week at Sotheby's for $45.4m, was listed among workshop and studio pictures in Ronald Lightbown’s 1978 catalogue of Botticelli’s work, before being included as an autograph work in an exhibition at Frankfurt's Städel Museum in 2009. Here, in a pair of opinion pieces, two Renaissance experts give their contrasting views on its attribution