Russia's economic and financial crisis is getting even worse and threatens to spiral out of control as the value of its currency falls.

Now, Apple has halted online sales of its products in Russia.

"Due to extreme fluctuations in the value of the [ruble], our online store in Russia is currently unavailable while we review pricing," Apple said in a statement sent to ABC News Tuesday. "We apologize to customers for any inconvenience."

Russia's Apple store continued to display a "We'll be back" message on Wednesday.

The ruble has fallen sharply in recent weeks and is down more than 50 percent since January because of sinking oil prices and the impact of Western sanctions imposed over Russia's involvement in Ukraine's crisis.

The selloff in Moscow has spread as nervous investors have pulled money from other developing nations.

"Concerns are mounting that bond troubles of big energy companies in emerging markets will unleash a new wave of market contagion," reported The New York Times.

The White House said President Obama plans to sign a fresh round of sanctions against Russia. Reuters reported that The European Union is getting ready to tighten sanctions on Russia by widening its ban on investments in Crimea.

Plummeting Gas Prices

With tumbling oil prices comes even cheaper gas. Average U.S. pump prices have fallen for 82 days in a row. The national average is now more than 70 cents cheaper than it was this time last year. Analysts say gasoline prices may drop another 20 cents a gallon by Christmas Day.

Markets Await Fed Statement

Global stocks are mostly lower today as oil prices tumble again and investors wait for a U.S. Federal Reserve statement on monetary policy. With the recent rise in economic growth, policymakers may drop language promising to keep interest rates low for a "considerable time," but no immediate change is expected.

American Apparel Truce

American Apparel has agreed to a temporary truce with its ousted founder Dov Charney, including re-hiring him as a "strategic consultant." Soon after Charney was fired last month for alleged misconduct, Charney and his attorney accused the retail company's board of directors of illegally firing him. The board cited him for alleged improper use of company funds and helping leak nude photographs of a former worker who was suing him.