President Joe Biden urged NATO allies to keep backing Ukraine in its war against Russia as he made his farewell visit to Germany Friday just weeks before US elections.
As Ukraine faces a third winter at war and battlefield losses in the east, Kyiv and its allies fear a potential return of Donald Trump to the White House would mean reduced US military support.
Biden said Western allies must "sustain our support... until Ukraine wins a just and sustainable peace.
"We're headed into a very difficult winter. We cannot let up."
In another worrying development for Ukraine, North Korea has decided to send a "large-scale" troop deployment to support Moscow's war, according to Seoul's spy agency. It said 1,500 special forces were already in eastern Russia undergoing training.
During his one-day visit, Biden met Chancellor Olaf Scholz before they held four-way talks with French President Emmanuel Macron and British Prime Minister Keir Starmer.
On Thursday, President Volodymyr Zelensky had presented his "victory plan" to the European Union and NATO, but his allies have not agreed to his request for immediate NATO membership.
Washington and London have also rejected Ukrainian requests for clearance to use donated long-range weapons against targets inside Russia. Berlin has refused to send its own long-range Taurus missile system.
"We are supporting Ukraine as powerfully as we can," said Scholz. "And at the same time we are making sure that NATO does not become a party to the war, so that this war does not turn into an even bigger catastrophe."
Calls for Gaza truce
The United States has been by far the biggest supplier of military aid to Ukraine since Russia launched its invasion in 2022. Germany is the next biggest supplier.
Paris and London were among foreign capitals to voice concern Friday over the report of North Korean troops readying to back the Russian war effort.
"The increase in cross-cooperation and military support from North Korea to the Russian war effort in Ukraine is very worrying," said Christophe Lemoine, spokesman for the French foreign ministry.
Speaking at the British embassy in Berlin, Starmer said "If this is true then to me it looks more like an act of desperation than anything else".
The other issue in focus was the Middle East conflict, where Biden and others voiced hope for new momentum toward a Gaza ceasefire after Israel killed Hamas leader Yahya Sinwar.
Biden said the death of Sinwar, considered the architect of October 7, 2023, attack on Israel, was a "moment of justice".
The US president said he had urged Israeli Prime Minister Benjamin Netanyahu to "also make this moment an opportunity to seek a path to peace, a better future in Gaza without Hamas".
Scholz said that after Sinwar's death, "hopefully the concrete prospect will now open up for a ceasefire and an agreement to release the hostages in Gaza", comments that were echoed by Starmer.
US election looms
Biden earlier received a red-carpet welcome from President Frank-Walter Steinmeier, who awarded him Germany's highest honour for championing bilateral and transatlantic ties.
The German head of state honoured 81-year-old Biden as "a beacon of democracy" who had shown unwavering support for NATO and Ukraine "in our most dangerous moment since the Cold War".
Biden's visit comes as the campaign race heats up ahead of the November 5 election and allies are nervously eyeing a possible Trump victory over Kamala Harris.
Trump, who berated NATO allies when president, has opposed the level of US military support for Ukraine and would be expected to soften US criticism of Israel in its wars in Gaza and Lebanon.
Steinmeier said that just a few years ago in the United States-Germany relationship "the distance had grown so wide that we almost lost each other.
"When you were elected president, you restored Europe's hope in the transatlantic alliance literally overnight," Steinmeier said, before awarding Biden the Grand Cross special class of the Order of Merit.
Biden was originally due in Germany last week for a four-day state visit that would have included a major Ukraine defence meeting with Zelensky.
He cancelled that trip to coordinate the response to Hurricane Milton, but was nonetheless at pains to make his valedictory Germany trip, albeit with a stripped-down programme squeezed into a one-day visit.