Kyiv, Ukraine—In the United States, Paul Manafort is facing prosecution on charges of money laundering and financial fraud stemming from his decade of work for a pro-Russian political party in Ukraine.

But in Ukraine, where officials are wary of offending U.S. President Donald Trump, four meandering cases that involve Manafort, Trump’s former campaign chairman, have been effectively frozen by Ukraine’s chief prosecutor.

The cases are just too sensitive for a government deeply reliant on U.S. financial and military aid, and keenly aware of Trump’s distaste for the investigation by special counsel Robert Mueller into possible collusion between Russia and his campaign, some lawmakers say.

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The decision to halt the investigations by an anti-corruption prosecutor was handed down at a delicate moment for Ukraine, as the Trump administration was finalizing plans to sell the country sophisticated anti-tank missiles, called Javelins.

The State Department issued an export license for the missiles on Dec. 22, and on March 2 the Pentagon announced final approval for the sale of 210 Javelins and 35 launching units. The order to halt investigations into Manafort came in early April.

Volodymyr Ariev, a member of Parliament who is an ally of President Petro O. Poroshenko, readily acknowledged that the intention in Kyiv was to put investigations into Manafort’s activities “in the long-term box.”

“In every possible way, we will avoid irritating the top American officials,” Ariev said in an interview. “We shouldn’t spoil relations with the administration.”

The Ukrainian investigators had been tracing money paid to Manafort and a New York law firm, Skadden, Arps, Slate, Meagher & Flom, by figures in the political party of Viktor F. Yanukovych, the Russian-leaning Ukrainian president who was ousted by street protesters and fled the country in 2014. Manafort was a longtime adviser to Yanukovych, working with him to revamp his public image and acquire a pro-Western patina that helped him win the presidency in 2010.

The new government established a special prosecutor to pursue corruption in the former administration. By late last year, the prosecutor, Serhiy Horbatyuk, had opened about 3,000 cases, including four related to Manafort’s consulting for the former president and his political party.

The order issued in April isolated these four investigations. The cases were not closed, the prosecutor general’s office said in a statement, but the order blocked Horbatyuk from issuing subpoenas for evidence or interviewing witnesses.

“We have no authority to continue our investigation,” Horbatyuk said in an interview.

Two months before Ukraine’s government froze the cases, Horbatyuk reached out to Mueller’s office with a formal offer to co-operate by sharing evidence and leads. Horbatyuk said that he sent a letter in January and did not receive a reply, but that the offer was now moot, since he has lost the authority to investigate.

But entries in the ledger appear to bolster Mueller’s money laundering and tax evasion case against Manafort, said Serhiy Leshchenko, a lawmaker who has closely followed the investigation. They indicate, for example, payments from Ukraine to a Cypriot company, Global Highway Ltd., that was also named in an indictment Mueller filed in federal court in Virginia this year. The company covered hundreds of thousands of dollars of Manafort’s bills at a high-end men’s clothing store and antique shop in New York.

In another move seeming to hinder Mueller’s investigation, Ukrainian law enforcement allowed a potential witness to possible collusion between the Trump campaign and Russia to leave for Russia, putting him out of reach for questioning.

David Sakvarelidze, a former deputy prosecutor general who is now in the political opposition, said he did not believe that the general prosecutor had co-ordinated with anybody in the United States on the decision to suspend the investigations in Ukraine, or that there had been a quid pro quo for the missile sale.

Ukrainian politicians, he said, concluded on their own that any help prosecuting Manafort could bring down Trump’s wrath.

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“Can you imagine,” Sakvarelidze said, “that Trump writes on Twitter, ‘The United States isn’t going to support any corrupt post-Soviet leaders, including in Ukraine.’ That would be the end of him.”

Last summer, another member of Parliament, Andrey L. Derkach, initiated an investigation into leaks to the news media about Manafort’s dealings from Ukrainian law enforcement, saying they put at risk vital U.S. aid to Ukraine. He has openly opposed any Ukrainian role in aiding the special counsel’s investigation.

Ukraine, Derkach said in an interview, would be taking grave risks if it assisted in what he called a politicized investigation in the United States. In Ukraine, he said, “everybody is afraid of this case.”