ALEXANDRIA, Va. — Paul Manafort, the political consultant and Trump presidential campaign chairman whose lucrative work in Ukraine and ties to well-connected Russians made him a target of the special counsel, Robert S. Mueller III, was sentenced on Thursday to nearly four years in prison in the financial fraud case that left his grand lifestyle and power-broker reputation in ruins.

[Paul Manafort released from prison due to spread of coronavirus.]

The sentence in the highest-profile criminal case mounted by the special counsel’s office was far lighter than the 19- to 24-year prison term recommended under sentencing guidelines. Judge T. S. Ellis III of the United States District Court in Alexandria, Va., said that although Mr. Manafort’s crimes were “very serious,” following the guidelines would have resulted in an unduly harsh punishment.

A team of Mr. Mueller’s prosecutors sat glum-faced as Judge Ellis delivered his decision. Mr. Manafort, who has gout and came to the hearing in a wheelchair with his foot heavily bandaged, had asked the judge for compassion. “To say I feel humiliated and ashamed would be a gross understatement,” he said in a barely audible voice, reading from a prepared statement.

Of the half-dozen former Trump associates prosecuted by Mr. Mueller, Mr. Manafort garnered the harshest punishment yet in the case that came to a conclusion on Thursday — the first of two for which Mr. Manafort is being sentenced this month. While prosecutors sought no specific sentence, some legal experts said a prison term that amounts to one-fifth of the lightest punishment recommended had to disappoint them.