MOSCOW -- Russian President Vladimir Putin will demand the return of two diplomatic compounds seized by the United States when he meets in Germany this week with President Trump for the first time, the Kremlin said, as a senior Russian official warned that Moscow’s patience on the issue was running out.

Putin’s foreign affairs adviser Yuri Ushakov said his government showed “unusual flexibility” by not retaliating in December when then-President Obama confiscated the two compounds, in New York state and Maryland, and expelled 35 Russian diplomats as punishment for Moscow’s alleged meddling in the 2016 U.S. presidential election.

Ushakov urged Washington to “free Russia from the need to take retaliatory moves,” according to The Associated Press.

The White House has reportedly been mulling returning the compounds in an effort to improve relations with Moscow, and in recent days Russian officials have warned that retaliatory measures have been drawn up if the compounds are not returned. They were nominally used by the Russian Embassy as recreational facilities, but U.S. intelligence has long argued they were bases for espionage.

In a separate statement released today, the Kremlin said Putin would raise the issue with Trump when the two meet in Hamburg, Germany, where the G-20 summit is being held Saturday. The statement said that the Kremlin expected Putin would convey the need to find the “most rapid resolution” on the issue, which it described as an “irritant” in Russian-U.S. relations.

The two leaders’ first meeting is highly anticipated, coming as investigations continue into possible collusion between members of Trump’s presidential campaign and Russian officials and as relations between Moscow and Washington are being described as at their worst since the Cold War.

There has been intense speculation for months over when the two presidents might come face to face. Since confirming the meeting last week, the White House has been light on details about what they will discuss.

“There’s no specific agenda. It’s really going to be whatever the president wants to talk about,” Trump’s national security adviser Lt. Gen. H.R. McMaster told reporters last week.

McMaster said administration officials had been tasked with drawing up options to confront Russia over “destabilizing behavior,” including cyberthreats and political subversion, as well looking for ways to cooperate on issues such as Syria and North Korea.

Today the Kremlin was more specific, issuing a broad list of areas where it said it believed it could cooperate with the United States. The top issues listed for discussion were Russia’s dissatisfaction with U.S. sanctions, its desire to cooperate on international terrorism, the Syria crisis and improving efforts around nuclear arms control.

Most of the issues resembled those the Kremlin frequently raised with the Obama administration, and the statement emphasized Moscow’s desire for a return to normal relations.

There is “significant potential for coordinating efforts,” the Kremlin statement said. “Our countries can do much together in resolving regional crises,” including Ukraine, Libya and the Israeli-Palestinian conflict. The statement also said Russia was eager to restore business links with the United States.

Russia’s Foreign Minister Sergey Lavrov on Friday told the news agency Interfax he hoped the meeting would lend clarity to the relationship and warned that not seeking to normalize relations would be a “huge mistake.”

In reality, however, it’s unclear that, beyond the return of the diplomatic compounds, there is much Putin and Trump will be able to ask of each other. In many areas, U.S. and Russian interests have little overlap, and that has not appeared to change under Trump.

On Syria the two have clashed, and last month a U.S. fighter shot down a warplane belonging to Russia’s ally President Bashar al-Assad. The White House has said sanctions will not be lifted on Russia until it withdraws from Crimea, and in the Senate both parties are drawing up more sanctions to punish Russia for its alleged election meddling.

“I don’t think we should expect any kind of a breakthrough,” said Maria Lipman, a veteran political analyst in Moscow. “I don’t think we should expect any significant results from this meeting. Not even the beginning of solutions to the major issues.”

During the presidential campaign and after the election, some Russian officials and state media expressed optimism that Trump would mean better relations with the United States. But such hopes have so far largely not materialized.

Lipman said she believes there is a growing realization in the Kremlin of Trump’s severely restricted ability to alter U.S. policy toward Moscow, given the intensity of the scandal around the Russia investigations.