BRUSSELS — Gathering in Brussels, European foreign ministers scrambled on Thursday to hold a united front against Russia over Ukraine, calming worries that the election of a far-left government in Greece hostile to sanctions could upend Europe’s policy toward Moscow.

This week’s victory of the anti-establishment Syriza party in Greece had been widely seen as enhancing dogged but previously unsuccessful efforts by Russia to divide members of the European Union and undermine the bloc’s sanctions policy.

In the end, however, Greece backed away from strong statements denouncing sanctions and joined other countries in the 28-member bloc in a unanimous vote in favor of expanding a list of sanctioned individuals, mostly Russians, and of work to prepare “any further action” to pressure combatants to respect a stillborn truce agreement from last year.

Greece also joined other countries in endorsing a six-month extension of sanctions imposed last March that would otherwise have soon expired.