By Christopher Whittall 

An executive at BlackRock Inc., one of the largest holders of Ukrainian government debt, said bondholders negotiating the country's debt restructuring should consider taking losses on their investments.

His comments contrast with the approach of a group of creditors who formed a committee in March to negotiate a deal with the conflict-torn country that wouldn't involve a reduction in the value of the bonds they hold.

Sergio Trigo Paz, head of emerging-markets fixed income at BlackRock, said Thursday that Ukraine's creditors should not rule out the possibility of cutting the size of the country's debt pile, which would involve investors sustaining losses on their bondholdings.

"That's why we prefer to sit on the sidelines" in the negotiations, said Mr. Trigo Paz, noting that the creditor committee is taking a "different approach."

"We always want to be constructive with countries in these situations. Right now, being constructive is staying on the sidelines," he added.

BlackRock is one of Ukraine's largest creditors, owning billions of dollars worth of bonds across both actively managed funds and those that track indexes.

The International Monetary Fund, which agreed in March to a $17.5 billion bailout package for Ukraine to help keep the country's economy afloat, said it is vital that a deal between the government and the creditors is completed by mid-June.

Mr. Trigo Paz described the situation in Ukraine as "very fragile." He said the country needs to restructure its debt "once and for all," instead of opting for a so-called soft restructuring which, he said, could see the country having to return to the negotiating table as early as next year.

The creditor committee consists of T. Rowe Price, TCW Group, BTG Pactual Europe and Franklin Templeton Investments, according to a statement issued by the group Monday. The firms own about $8.9 billion of Ukraine debt among them. The largest chunk of that is owned by Franklin Templeton Investments, which is taking a lead role in the committee, according to a person familiar with the matter.

In a statement Monday, the committee said it had provided Ukraine's finance ministry with a "detailed proposal that the committee believes meets the objectives of the ministry without any principal debt reductions and would provide the country with a solid foundation for economic recovery."

A spokesperson for the creditor group, which is being advised by Blackstone Group International Partners LLP and Weil, Gotshal & Manges LLP, declined to comment Thursday.

Ukraine, advised by Lazard Ltd. and White & Case LLP, last week voiced concerns "about the approach taken by the creditors' committee" as well as "their lack of willingness to engage in negotiations."

On Tuesday, Ukraine's parliament passed a bill allowing the government to halt payments on some foreign debts.

Chiara Albanese contributed to this article.

Write to Christopher Whittall at christopher.whittall@wsj.com

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