Russian President Vladimir Putin has said that he wants to seize the entire region, parts of which Kyivโ€™s forces still hold. Zelenskyy has ruled out ceding this territory, arguing that Putin could use it as a base to again attack Ukraine. Russia currently occupies about one-fifth of Ukraineโ€™s territory.

Secretary of State Marco Rubio warned Thursday that stalemates are โ€œvery dangerousโ€ because they either end in a negotiated settlement or escalation. In the context of Ukraine, that โ€œcould wind up being a sabotage campaign in neighboring countries that are members of NATO,โ€ he said.

European leaders are growing increasingly concerned about Russia escalating and expanding the conflict onto the continent.

โ€œIn the end, we do not believe that there is a military solution to this conflict, to this war. We think this war needs to end in a negotiated settlement,โ€ Rubio said. โ€œThe sooner, the better.โ€

In separate comments to the Greek newspaper Kathimerini, Rubio said โ€œthere donโ€™t seem to be prospects of a negotiated settlementโ€ on peace in Ukraine right now. Kremlin spokesman Dmitry Peskov responded by saying he agreed with Rubioโ€™s assessment, the Russian state news agency Tass reported.

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Russian President Vladimir Putin hosts a meeting with Steve Witkoff and Jared Kushner in Moscow on Sept. 5.Gavriil Grigorov / AFP via Getty

The U.S. diplomatic efforts to end the war were revived last month when Witkoff and Kushner traveled to Moscow and, for the first time, Kyiv. No major breakthroughs were announced.

The White House has previously repeated some of Putinโ€™s hard-line demands and tried to push Kyiv for concessions.

Putin explained the invasion by saying Russia was trying to demilitarize Ukraine and overthrow Kyivโ€™s government, which he said is driven by โ€œNazi ideologyโ€ โ€” a common Kremlin propaganda line.

What was supposed to be a swift military operation to topple Zelenskyy and replace him with a pro-Kremlin government quickly foundered, leaving the capture of Donbas as Putinโ€™s only option to claim a significant victory in Ukraine.