By Josie Cox 

European stocks came under fresh pressure Tuesday, a day after high-stakes talks between Athens and eurozone finance ministers collapsed abruptly, sparking fresh doubts over Greece's future inside the currency bloc.

In early trade, the Stoxx Europe 600, which hit a seven-year high last week, fell 0.6% before recovering marginally, mirroring similar losses across country indexes in the region.

In Greece, the main stock index in Athens, which has plummeted more than 23% over the past six months, declined more than 4% before recovering to trade around 1.5% lower, while bond yields soared anew, signaling a fall in bond prices. The drop in Greek stocks follows a 3.9% fall on Monday.

The country's debt curve remains clearly inverted, meaning that shorter-dated bonds yield substantially more than longer-dated bonds. This generally indicated that investors see a heightened risk of the country defaulting on its bonds. The spread in yields being quoted by different brokers is also very high, indicating uncertainty in the market.

Speaking about Monday's meeting between Greek Finance Minister Yanis Varoufakis and his European counterparts, Barclays economists Antonio Garcia Pascual and Thomas Harjes said discussions "ended early and little, if any, progress was achieved."

Economists at Citigroup said that "while not entirely surprising, the lack of any progress and the 'red lines' on all sides highlights the challenges ahead."

Lee Hardman, a currency economist at Bank of Tokyo-Mitsubishi UFJ, noted that it is becoming more likely that Greece will exit its current bailout program at the end of the month.

"Without financial support being in place, it is likely that deposit and capital flight from Greek banks and Greece will accelerate significantly, " he said.

"It will increase pressure on the [European Central Bank] to withdraw emergency liquidity assistance for Greek banks undermining financial stability in Greece providing a significant negative shock for the economy."

The ministers Monday called off the negotiating session just a few hours after it began, saying Greece left them little hope of securing an agreement. In turn, they presented the new left-wing government in Athens with an ultimatum: Agree to an extension of the current EUR240 billion ($272 billion) bailout by the end of the week or lose the lifeline of rescue loans that have sustained Greece for nearly five years.

Greek Prime Minister Alexis Tsipras and Mr. Varoufakis, oppose the terms of the rescue deal from the eurozone and the International Monetary Fund, saying they are hurting its economy and society.

"The gap between the two parties is still much akin to a political Grand Canyon," rates strategists at Rabobank wrote in a note.

Directly after talks were abandoned the euro declined to $1.1320 against the dollar, although it recovered to trade around 0.4% higher early Tuesday at $1.138.

Adding to the downbeat mood in European markets, was a fresh bout of violence in eastern Ukraine. On Monday, fighting blazed around the strategic-transport hub of Debaltseve despite a cease-fire that went into effect at midnight Saturday and was supposed to end months of conflict between Ukrainian forces and Russia-backed militants in Ukraine's east.

German Chancellor Angela Merkel's spokesman said early Tuesday that Ms. Merkel, Ukrainian President Petro Poroshenko and Russian President Vladimir Putin had agreed "concrete steps" to allow the Organization for Security and Cooperation in Europe to monitor the shaky cease-fire.

Russia's Micex stock index was trading 0.7% lower early Tuesday while its dollar-denominated RTS counterpart declined 0.3%. One dollar now buys 63.1 ruble, 74% more than six months ago.

In the U.K, sterling fell marginally before recovering after consumer-price inflation for January cooled to its lowest annual rate in more than 50 years. Elsewhere, Germany's ZEW index showed that economic sentiment increased for a fourth consecutive month.

In commodity markets, Brent crude was 1.2% higher at $62.14. Gold declined 0.4% to $1,222.70 a troy ounce.

In the U.S., the S&P 500 is indicated opening 0.3% lower. Futures, however, don't always accurately reflect moves after the opening bell.

Write to Josie Cox at josie.cox@wsj.com

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