By Matt Day 

J.P. Morgan Chase & Co. won't include any new bonds issued by Russian companies subject to U.S. sanctions in its debt indexes.

The Obama administration on Wednesday escalated its sanctions against Russia over alleged interference in Ukraine's crisis, essentially prohibiting U.S. companies--and fund managers--from providing equity financing or long-term debt funding to a slate of Russian energy and defense firms.

The firms placed on the Treasury Department's sanctions list include state-controlled oil giant OAO Rosneft; OAO Novatek, Russia's No. 2 gas company; Gazprombank, the bank tied to gas-export monopoly OAO Gazprom; and Vnesheconombank, a state-owned development lender.

In a notice sent to clients late Thursday, J.P. Morgan said new bonds issued by those companies wouldn't be included in its indexes "due to investors' inability to replicate the benchmark."

Existing debt of the companies isn't affected, the bank said, and will remain in J.P. Morgan's indexes.

J.P. Morgan's bond indexes serve as the benchmark for many money managers who invest in emerging-market debt. The indexes affected by Thursday's announcement are the benchmark for investors who oversee a combined $379 billion, the bank said.

Oil firm TNK-BP, which is controlled by Rosneft, wasn't mentioned on the sanctions list, but is included on J.P. Morgan's roster of companies whose new debt wouldn't be eligible for its indexes.

Vnesheconombank bonds, such as those maturing in 2025 with a 6.8% coupon, constitute 0.55% of J.P. Morgan's EMBI Global Diversified Index, the bank said. Gazprombank, Novatek, Rosneft and TNK-BP together account for 0.76% of the bank's CEMBI Broad Diversified index.

EMBI comprises dollar-denominated bonds issued by governments and wholly state-owned entities, while CEMBI tracks dollar-denominated corporate bonds. Investment funds managing about $313 billion use EMBI as a benchmark, the bank said, and funds overseeing $66.3 billion track CEMBI.

The yield on Rosneft's dollar-denominated bonds maturing in 2017 soared to a two-month high of 4.16% on Friday from 2.86% the previous day. Prices and yields move in the opposite direction.

Trading activity in the existing bonds of sanctioned firms fell after the announcement on Wednesday, said Jim Craige, a portfolio manager with Stone Harbor Investment Partners LP in New York, which manages about $62.5 billion. "Everyone is under the assumption that you can trade the debt at the moment, but there may be a time when you can't."

Russian companies have largely avoided issuing dollar-denominated debt since the tensions between Russia and Ukraine ramped up in early March. Dollar bonds accounted for 30% of the debt Russian firms issued between January and the end of February, according to data provider Dealogic. Since then, dollar bonds have made up 10% of Russian firms' new borrowing.

The pace of borrowing slowed, too, from $8.5 billion in all currencies during the first two months of the year to $10.7 billion in the more than four months since, according to Dealogic.

"It's a much tougher sell right now to buy a new (bond) issue from Russia than in any point in quite a while," Mr. Craige said.

Write to Matt Day at matt.day@wsj.com

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