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U.K. Prime Minister Rishi Sunak a planned meeting with Greek Prime Minister Kyriakos Mitsotakis in London a week ago, accusing him of seeking to “grandstand� by publicly campaigning for the return of the while visiting Britain.

Sunak said his government had no intention of re-opening the issue or amending legislation that would block the artifacts’ return.

Mitsotakis described the incident as “an unfortunate moment� but added that the campaign for their return had received a boost after Sunak’s cancellation drew international attention.

The British Museum said it was continuing talks with Greek authorities and the Acropolis Museum, raising hopes in Athens that an arrangement could be reached to display the sculptures in Greece. On Tuesday, Acropolis Museum director Nikolaos Stampolidis said his museum maintained “excellent relations� with the British Museum and expressed confidence that the Parthenon Marbles would eventually be returned.

“After all, culture is not only about art. It's also about relationships,� he said. Excavated in southern Italy, the water jug known as Meidias Hydria, considered to be a masterpiece of the Athenian potter Meidias, became part of the British Museum collection 250 years ago and has not left the London museum until now.

Just over 50 centimeters (19.5 inches) in height, the vessel is decorated with scenes from Greek mythology including a depiction of Heracles, the legendary Greek hero renowned for his strength.

The jug will be displayed at the Acropolis Museum in Athens through April, when it will move to 2024 Olympics host city to be included in an exhibition at the Louvre Museum.

The Athens exhibition, "Meanings: Personifications and Allegories, from Antiquity to Today,� will open to the public on Thursday and includes 165 works of art, many from other major European museums. Many are being loaned for the first time.