BERLIN — When the Kremlin released its summary of President Vladimir Putin’s call Tuesday with President Donald Trump, one thing was unmistakable: The Russian leader hadn’t retreated from his maximalist aims in Ukraine and had conceded little.

Much of what Putin agreed to during the call — including a limited 30-day halt on energy infrastructure strikes by both sides, a prisoner exchange and talks about security in the Black Sea — was spun as a concession to Trump in the respective summaries of the conversation released by Moscow and Washington.

But all were goals that the Kremlin has pursued and seen as advantageous in the past. Russia and Ukraine previously reached a tacit mutual agreement to refrain from energy infrastructure strikes, which have caused pain for both countries. Russia has long conducted prisoner exchanges with Ukraine, seeing the repatriation of its soldiers as a key Kremlin interest. And uninterrupted trading in the Black Sea is critical to Russia’s economy.

The lack of clear concessions on the Russian side stoked fears among Ukraine’s backers that Putin was playing for time, hewing to his staunch demands while hoping, in the meantime, that Washington’s tattered relationship with Ukraine fully breaks or that Ukrainian forces face a battlefield collapse.

Putin’s demands on Ukraine appeared unchanged.

During the call, the Kremlin said, Putin reiterated requirements for a comprehensive 30-day ceasefire that he knows are nonstarters for Ukraine. He claimed that the Ukrainians had sabotaged and violated agreements in the past, accusing Ukraine of committing “barbaric terrorist crimes” in the Kursk region.

Putin also identified his “key condition” for settling the conflict more broadly: a complete cessation of outside military and intelligence support for Ukraine. Such an outcome, analysts say, would make Ukraine, a country far smaller than Russia, permanently hostage to Moscow’s overwhelming military superiority and forever stranded within the Kremlin’s orbit, without any counterbalancing backers.

The Kremlin may be hoping that during the course of negotiations, an already impatient Washington walks away from Ukraine for good, freeing Putin to continue his war while separately reestablishing relations with the United States.

Russia may also be counting on the possibility that Ukraine, facing an increasingly dire picture on the battlefield and the loss of its biggest backer, ultimately agrees to an erosion of its sovereignty that benefits the Kremlin.

“The best outcome for Putin is one where he accomplishes his aims in Ukraine and can normalize relations with the U.S.,” said Andrea Kendall-Taylor, a former U.S. intelligence official who is an analyst at the Center for a New American Security, a think tank in Washington. “So Putin wants to string Trump along to give him just enough to see if he can accomplish that.”

Kendall-Taylor added that Putin will feel he has little to lose, believing that Trump “won’t be willing to really ramp up pressure on Russia or recommit to Europe.”

Russia, while giving little on Ukraine, has begun trying to lure Washington with the fruits of a rapprochement. Russian officials have been touting their vast reserves of rare earth metals, saying they would be happy to exploit them with American companies, and holding out possible deals for American investors in Russia’s energy sector.

Putin and Trump spent part of the discussion talking about what the Kremlin called “a wide range of areas in which our countries could establish interaction,” including ideas about cooperation in the energy sector. The Russian leader, according to the Kremlin, secured Trump’s agreement to hold hockey tournaments with Russian and American professional players facing off against one another.

Alexander Gabuev, director of the Carnegie Russia Eurasia Center, said the Kremlin would be hoping to get the United States to restore ties without predicating renewed relations on an end to the fighting in Ukraine. That’s why the Kremlin is front-loading the discussion with all the potential benefits for the United States from a renewed relationship with Russia.

“The impression is that they have a very, very, very good reading of Trump,” Gabuev said. “They know where the weak spots are, they know how to massage his ego. To me, the Russian team is winning at this point.”