European stocks took a beating 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% mirroring similar losses across country indexes in the region. German stock-exchange operator Deutsche Börse's Eurex futures and options platform opened with a delay, with traders citing technical issues.

In Greece, Athens main stock index, which has plummeted 22% over the past six months, declined 4.6%, 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.

Directly after talks were abandoned the euro declined to $1.1320 against the dollar, although it recovered somewhat in early European trading Tuesday to around $1.1344. However, it remains more than 6% lower so far this year, largely driven by diverging monetary policy in Europe and the U.S.

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 commodity markets Tuesday, Brent crude was 0.2% higher at $61.56. Gold declined 0.3% to $1,223.60 a troy ounce.

Later in the day, investors will have an eye on the German ZEW economic sentiment release for January, which is due at 10:00 GMT.

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

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