A top adviser to Russian President Vladimir Putin on Monday threatened potential “retaliatory moves” against the United States if a pair of diplomatic compounds, including one in Upper Brookville, are not returned soon.

The Obama administration shuttered the 14-acre North Shore property in December and expelled 35 Russian diplomats in retaliation for alleged Moscow-directed cyberattacks before the U.S. presidential election.

The Russian government denies that it hacked into computers to influence the election.

Yuri Ushakov, Putin’s foreign affairs adviser, said Monday that the Kremlin had shown “unusual flexibility” in not responding to former President Barack Obama’s action, but that Moscow’s patience “has its limits.”

Ushakov urged the Trump administration to return the Upper Brookville house along with another compound in Maryland to “free Russia from the need to take retaliatory moves.” He did not specify what those moves would be.

Upper Brookville Village Mayor Elliot Conway declined to comment Monday.

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Conway told Newsday earlier this year that the gate to the compound, known as the Norwich House, “is padlocked and the property remains under State Department control.”

Putin is expected to demand the return of the two compounds when he meets with President Donald Trump later this week in Hamburg, Germany, at the G-20 summit.

The White House has reportedly been mulling returning the compounds to improve relations with Moscow, but a State Department spokesman said last month that the United States and Russia had reached no agreements on the properties.

The Soviet Union bought the Upper Brookville mansion and surrounding property in 1952 to house the Soviet delegate to the United Nations, according to a Sept. 18, 1952, Newsday article. The Soviets had previously purchased a mansion in nearby Glen Cove, which Russia still owns. That property, called Killenworth, was not affected by the Dec. 29 closure order.

With AP