By Peter Evans 

LONDON--The dramatic fall in the ruble is starting to hurt Western multinationals, adding to their list of problems in Russia after a year of turmoil.

For most of 2014, U.S. and European businesses with operations in Russia have battled against a slowing economy and escalating political tensions with the West following the crisis in Ukraine.

The ruble has fallen steadily through the year, but its sharp decline in recent weeks has exacerbated an already-fragile situation, according to company executives and analysts. The ruble dropped to a fresh record low of 57.9860 against the dollar in early trade on the Moscow exchange despite Russian central-bank intervention and a Thursday rate hike, taking its year-to-date decline to more than 44%.

"Western multinationals in Russia will be feeling very nervous," said Timothy Ash, an economist at Standard Bank.

The pain is sharpest for companies in Europe, where exposure to Russia is far higher than in the U.S. Carlsberg A/S, the world's fifth-largest beer company by volume, has lowered its profit forecasts twice already this year and seen its shares drop more than 18%. Many analysts expect the company's growth in Russia next year will be canceled out by the weakening ruble.

"It is hard to see a solution just around the corner," Carlsberg Chief Executive Officer Jørgen Buhl Rasmussen said on Thursday, referring to the ruble's slump.

Carlsberg is Russia's biggest brewer and generates around 40% of its earnings before interest and tax in Eastern Europe. A spokesman for the company said: "Despite current challenging macro conditions, we remain committed to the Russian market in the long term."

Carlsberg isn't alone in feeling the heat in Russia. The combination of political tension, the impact of falling oil prices and the plunging value of the ruble mean an economy many global companies once looked to for growth has now become a drag.

Last month, Imperial Tobacco Group PLC singled out weakness in Russia as it posted a 7% decline in sales by volume across the company. Imperial's rival British American Tobacco PLC has also highlighted concerns over the Russian economy.

U.S. and European companies have also had to cope with increased scrutiny of their operations from the Russian government, a strategy seen by experts as a response to Western sanctions against Russia following the conflict in eastern Ukraine.

Russian authorities have inspected a number of McDonald's Corp. outlets for alleged sanitary violations, resulting in the closure of several restaurants. PepsiCo Inc. and Danone SA have both recently been accused by Russian politicians of using cheap and unhealthy ingredients in their products.

But the ruble is a major concern for many top executives. Unilever PLC, the world's second-largest maker of consumer products after Procter & Gamble Co., has said the falling currency in Russia has been part of its recent problems in emerging markets overall. The company recently surpassed EUR1 billion ($1.25 billion) in sales in Russia, having entered the country in 1992, but has seen many of its gains in the past year wiped out by the ruble's slide.

"The ruble is down, the Ukrainian currency is down. It is not helping," Chief Executive Officer Paul Polman said earlier this year.

The ruble's slide has been especially painful for smaller companies that rely on Russia for large chunks of their business, particularly those in Central Europe and Eastern Europe.

German glassmaker Saint-Gobain Oberland AG on Friday issued a profit warning and said it would be unlikely to pay a dividend this year, blaming the macroeconomic situation in Russia and Ukraine.

Many Finnish companies have expanded into Russia during the past decade, including paint maker Tikkurila Oyj and premium tire maker Nokian Tyres PLC. Both have seen their share price fall sharply this year after the ruble's weakness forced them to cut their profit guidance for 2014.

Finnish bakery chain Leipurin Oyj called off its initial public offering on Dec. 3, citing uncertainty caused by the ruble's collapse.

Jens Hansegard in Stockholm and Juhana Rossi in Helsinki contributed to this article.

Write to Peter Evans at peter.evans@wsj.com

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