WASHINGTON — President Donald Trump’s latest embrace of Russian leader Vladimir Putin is deepening alarm in Washington and among America’s allies that the White House pressure campaign could leave Ukraine vulnerable as Moscow advances.

Trump’s push to end the war, which has raged since 2022, comes on the cusp of a midterm election that could give Democrats partial or full control of Congress, expanding their oversight powers, and as polls show more than two-thirds of Americans disapprove of the president’s handling of foreign policy and support Kyiv’s fight against Russian aggression.

On Monday, Trump dismissed Russia’s ongoing assault on its neighbor, telling reporters that “they haven’t been doing much,” even as Russian forces bombed a park in Kharkiv that day, killing a mother and her 14-month-old child in her stroller.

Two days later, in St. Petersburg, Trump’s special envoy, Steve Witkoff, described Putin as a “humanitarian,” despite his invasion unleashing Europe’s deadliest conflict since World War II.

“You talk so much about Trump being a humanitarian — you are a humanitarian also, sir,” Witkoff said after securing the release of a detained U.S. citizen from the Kremlin. At least two other Americans, both from Los Angeles, remain wrongfully detained by Russia. “I salute you, and I commend you,” he added.

Rep. Don Bacon, R-Neb., described Witkoff’s remarks as “another embarrassment” after a steady stream of entreaties to Moscow from the Trump administration.

The diplomatic push follows Trump’s decision two weeks ago to import Russian diesel, a move that could bolster Moscow’s war effort and violate U.S. law. Days later, after Ukrainian President Volodymyr Zelensky publicly condemned the move, Trump ally Elon Musk reportedly throttled the speed of Starshield, a military-grade satellite internet service from Starlink that Kyiv relies on to defend itself against Russian attacks.

The Trump administration failed to provide Kyiv with intelligence warnings of incoming ballistic missile strikes, blaming the weather. The president waived sanctions on Russia that were passed just months earlier with overwhelming bipartisan support in the aftermath of the death of Sen. Lindsey Graham, a Trump ally and Ukraine supporter. And Trump declined to approve the transfer of interceptor missiles to Ukraine — more defensive weaponry used to protect the country from Russian strikes that have increasingly targeted civilian areas.

The developments have raised fresh questions over whether Trump has exceeded his legal authority in reshaping U.S. policy on Ukraine.

Russian diesel imports could violate a 2022 federal ban, the Ending Importation of Russian Oil Act, and throttling Starshield, withholding intelligence and delaying missile transfers could breach contractual or statutory obligations set forth by Congress — all potential subjects of investigation for a willing Congress.

And Trump’s push comes at a moment of political peril, as he faces the prospect of a Democratic-led legislature and a Republican Party ready to move beyond his lame-duck presidency.

But freedom from political obligation could also allow Trump to pursue his agenda without the needs for coalitions or popular support.

The prospect of an unchecked Trump has stoked fears on Capitol Hill that the White House could abandon Kyiv altogether.

Nine senators from both parties have asked the Pentagon’s inspector general to investigate the Starlink episode, while lawmakers across the aisle have condemned the speed restrictions. And should they take power after the midterms, Democrats are also weighing whether to make Defense Secretary Pete Hegseth’s resignation a condition of further defense funding, citing his criticism of Ukraine, according to a report in the newspaper the Hill.

“Congress will unequivocally reaffirm that Ukraine is an indispensable ally to the United States, that Russia is a self-declared enemy of the United States, and that the United States will 100% support and defend the people of Ukraine in their fight for their own freedom against this brutal, illegal, and unprovoked Russian invasion,” said Rep. Brian Fitzpatrick, R-Pa.

“The United States must provide any and all defensive equipment that Ukraine needs to defend itself,” Fitzpatrick added. “Anyone who attempts to limit the use of Starshield for Ukraine will be fully investigated and will be held fully accountable, to include public congressional oversight hearings.”

Marco Rubio, the president’s secretary of State and national security adviser, was initially silent on Trump’s moves. But he ultimately defended them when confronted by reporters on a recent visit to Central Asia.

“We’re no longer going to be defensive about this topic,” Rubio said. “If it were not for the assistance of the United States, including under the Trump administration, there would be no Ukraine right now. Ukraine, as a sovereign state, would not exist.”

Still, Rep. Michael R. Turner, R-Ohio, a former chair of the House Intelligence Committee, said Sunday that Rubio’s explanation of Ukraine’s loss of Starlink access was “absolutely not” sufficient.

“This is something where there needs to be an investigation, there needs to be a congressional investigation,” Turner told CBS. “Lives are at risk, and lives are lost over these things.”

Trump has told reporters in recent days that his goal remains to secure a peace deal that ends the world’s deadliest conflict since World War II. But Mitt Romney, a former GOP senator from Utah and the Republican presidential nominee in 2012, dismissed Trump’s arguments as a break from U.S. values.

“Churchill could have shortened WW2 by years if he had just ‘done a deal’ with Hitler,” Romney wrote on social media. “George Washington could have done a deal to end the American Revolution.”

Zelenskyy “is in good company,” he added.

Europe, too, is preparing for a new confrontation with the Trump administration over the defense of Ukraine.

Germany’s chancellor rejected Trump’s approach, saying of Europe, “We are the firewall.” And the European diplomatic service responded with derision to Trump’s waiver of sanctions.

“When Russia escalates aggression against Ukraine,” the European Union’s diplomatic service said in a statement, “Europe responds with more pressure on the aggressor.”

Trump has floated a trilateral summit with Putin and Chinese President Xi Jinping in Shenzhen, China, next month, fueling European fears that he could strike a deal on Ukraine without Kyiv at the table.

The Russians and Ukrainians agreed this week in principle to begin peace talks at a technical level moderated by the United States. No timeline or framework has been set for the talks.

In an interview on Fox News, Zelenskyy said that he was prepared to agree to a peace deal that froze the existing battle lines, ceding nearly a quarter of Ukrainian land to Russian control. Over the last year, Russia has demanded that Kyiv also relinquish land in the Donbas region that it has failed to conquer through military means.

“Right now, we have to freeze. And I think this is a real way to end this war. We call this ceasefire,” Zelenskyy said. “This is minimum what we need from Russia today.”

“The most important is peace, and secure peace,” he added, “not to be afraid that occupation will come back, aggression will come back, killing will come back.”

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