Story highlights 2015 looks like being a very difficult year for the euro and the European Union, Oakley says

Anti-austerity party Syriza could win snap election in Greece, threatening to reverse reforms

Spain and Portugal have euroskeptic parties riding high in polls, and elections due soon

Robin Oakley was political editor and columnist for The Times newspaper in London from 1986 to 1992, the BBC's political editor from 1992 to 2000, and CNN's European Political Editor between 2000 and 2008. The opinions expressed in this commentary are solely his.

(CNN) Few European Union politicians will have raised a New Year glass in expectation of a brighter future. Many fear that 2015 could be the year in which both the euro and the European Union itself begin to unravel.

Once again the troubles will begin early in Greece, a country carelessly admitted to the euro before its finances were properly in shape, and which has twice had to be bailed out and bullied into efforts to get its economy onto a sound footing.

Once again the Greek economy is at the heart of a euro crisis. The failure of the Greek government led by Antonis Samaras to win a majority vote for its favored presidential candidate means that Greece faces a snap general election on January 25, news that saw the Greek stock market fall 5% in one day.

Polls suggest that the likely winner in the Greek general election will be Alexis Tsipras and his left-wing populist party, Syriza. The problem with that for the EU is that with more than a quarter of the Greek population unemployed, despite some signs of recovery in the economy, Syriza is winning wide support for its pledge to dump most of the pledges attached to its bailouts by the rest of Europe.

Tsipras wants to end the austerity program imposed largely at Germany's insistence, reverse cuts in the minimum wage and repudiate much of Greece's debts. Although Tsipras has toned down his previous rhetoric and says he wants Greece to remain in the euro, it is hard to see how it could if he wins and holds to his election promises.

Read More