Ukrainian President Volodymyr Zelensky speaks during an interview with Julie Pace, senior vice president and executive editor of the Associated Press, on a train traveling from the Sumy region to Kyiv, Ukraine, on Tuesday. Efrem Lukatsky/Associated Press

ON A TRAIN FROM SUMY TO KYIV, Ukraine — Ukrainian President Volodymyr Zelensky warned Tuesday that unless his nation wins a drawn-out battle in a key eastern city, Russia could begin building international support for a deal that could require Ukraine to make unacceptable compromises. He also invited the leader of China, long aligned with Russia, to visit.

If Bakhmut fell to Russian forces, their president, Vladimir Putin, would “sell this victory to the West, to his society, to China, to Iran,” Zelensky said in an exclusive interview with the Associated Press.

“If he will feel some blood – smell that we are weak – he will push, push, push,” Zelensky said in English, which he used for virtually all of the interview.

The leader spoke to the AP aboard a train shuttling him across Ukraine, to cities near some of the fiercest fighting and others where his country’s forces have successfully repelled Russia’s invasion. Zelensky rarely travels with journalists, and the president’s office said AP’s two-night train trip with him was the most extensive since the war began.

Since then, Ukraine – backed by much of the West – has surprised the world with the strength of its resistance against the larger, better-equipped Russian military. Ukrainian forces have held their capital, Kyiv, and pushed Russia back from other strategically important areas.

But as the war enters its second year, Zelensky finds himself focused on keeping motivation high in both his military and the general Ukrainian population – particularly the millions who have fled abroad and those living in relative comfort and security far from the front lines.

Zelensky is also well aware that his country’s success has been in great part due to waves of international military support, particularly from the United States and Western Europe. But some in the United States – including Republican Donald Trump, the former American president and current 2024 candidate – have questioned whether Washington should continue to supply Ukraine with billions of dollars in military aid.

Trump’s likely Republican rival, Florida Gov. Ron DeSantis, also suggested that defending Ukraine in a “territorial dispute” with Russia was not a significant U.S. national security priority. He later walked that statement back after facing criticism from other corners of the Republican Party.

“The United States really understands that if they stop helping us, we will not win,” Ukrainian President Volodymyr Zelensky said during an interview on Tuesday. Efrem Lukatsky/Associated Press

Zelensky didn’t mention the names of Trump or any other Republican politicians – figures he might have to deal with if they prevailed in 2024 elections. But he did say that he worries the war could be impacted by shifting political forces in Washington.

“The United States really understands that if they stop helping us, we will not win,” he said in the interview. He sipped tea as he sat on a narrow bed in the cramped, unadorned sleeper cabin on a state railway train.

The president’s carefully calibrated railroad trip was a remarkable journey across land through a country at war. Zelensky, who has become a recognizable face across the world as he doggedly tells his side of the story to nation after nation, used the morale-building journey to carry his considerable clout to regions close to the front lines.

He traveled with a small cadre of advisers and a large group of heavily armed security officials dressed in battlefield fatigues. His destinations included ceremonies marking the one-year anniversary of the liberation of towns in the Sumy region and visits with troops stationed at front-line positions near Zaporizhzhia. Each visit was kept under wraps until after he departed.

Zelensky recently made a similar visit near Bakhmut, where Ukrainian and Russian forces have been locked for months in a grinding and bloody battle. While some Western military analysts have suggested that the city is not of significant strategic importance, Zelensky warned that a loss anywhere at this stage in the war could put Ukraine’s hard-fought momentum at risk.

“We can’t lose the steps because the war is a pie — pieces of victories. Small victories, small steps,” he said.

Zelensky’s comments were an acknowledgement that losing the 7-month-long battle for Bakhmut – the longest of the war thus far – would be more of a costly political defeat than a tactical one.

He predicted that the pressure from a defeat in Bakhmut would come quickly — both from the international community and within his own country. “Our society will feel tired,” he said. “Our society will push me to have compromise with them.”

So far, Zelensky says he hasn’t felt that pressure. The international community has largely rallied around Ukraine following Russia’s Feb. 24, 2022, invasion. In recent months, a parade of world leaders have visited Zelensky in Ukraine, most traveling in on trains similar to the ones the president uses to crisscross the country.

In his AP interview, Zelensky extended an invitation to Ukraine to one notable and strategically important leader who has not made the journey – Chinese President Xi Jinping.

“We are ready to see him here,” he said. “I want to speak with him. I had contact with him before full-scale war. But during all this year, more than one year, I didn’t have.”

China, economically aligned and politically favorable toward Russia across many decades, has provided Putin diplomatic cover by staking out an official position of neutrality in the war.

Asked whether Xi would accept an invitation from Zelensky – or whether one had been officially extended – Chinese Foreign Ministry spokeswoman Mao Ning told reporters she had no information to give. She did say that Beijing maintains “communication with all parties concerned, including Ukraine.”

Kremlin spokesman Dmitry Peskov, asked whether a meeting between Xi and Zelensky would be useful to resolve the conflict in Ukraine, said Russian authorities “highly appreciate” China’s balanced position on the issue and “have no right to come up with any advice” on whether the two should meet. “The Chinese leader himself decides the appropriateness of certain contacts,” Peskov said during his daily conference call with reporters Wednesday.

Xi visited Putin in Russia last week, raising the prospect that Beijing might be ready to provide Moscow with the weapons and ammunition it needs to refill its depleted stockpile. But Xi’s trip ended without any such announcement. Days later, Putin announced that he would be deploying tactical nuclear weapons to Belarus, which neighbors Russia and pushes the Kremlin’s nuclear stockpile closer to NATO territory.

Zelensky suggested Putin’s move was intended to distract from the lack of guarantees he received from China.

“What does it mean? It means that the visit was not good for Russia,” Zelensky speculated. He was unsparing in his assessment of Putin, calling him an “informationally isolated person” who had “lost everything” over the last year of war.

“He doesn’t have allies,” Zelensky said.

The Ukrainian president makes few predictions about the biggest question hanging over the war: how it will end. He expressed confidence, however, that his nation will prevail through a series of “small victories” and “small steps” against a “very big country, big enemy, big army” – but an army, he said, with “small hearts.”

And Ukraine itself? While Zelensky acknowledged that the war has “changed us,” he said that in the end, it has made his society stronger.

“It could’ve gone one way, to divide the country, or another way – to unite us,” he said. “I’m so thankful. I’m thankful to everybody – every single partner, our people, thank God, everybody – that we found this way in this critical moment for the nation. Finding this way was the thing that saved our nation, and we saved our land. We are together.”

Julie Pace is senior vice president and executive editor of the Associated Press. Hanna Arhirova is a Ukraine-based AP correspondent.