Hungarian Prime Minister Viktor Orban accused Greece Thursday of not fulfilling its obligations as a member of the deal that allows free movement within the European Union.

Orban made the comment in a joint news conference with South Korean President Park Geun-hye and the prime ministers of the Czech Republic, Poland and Slovakia after the inaugural summit between South Korea and the Visegrad Group.

He did not elaborate on what he meant by Greece's failure to fulfill its obligations.

He said through an interpreter that activities for the Schengen agreement should continue, noting every country should take measures for their national security within their borders.

Czech Prime Minister Bohuslav Sobotka also said the Schengen agreement should be kept intact and it should never fall apart.

The agreement, named after the village of Schengen in Luxembourg, allows people to move freely within the European Union without a visa, but its merit is being questioned following the deadly terror attacks in Paris last month and amid mass migration from people of non-EU member states.

Still, Sobotka said there should be no restriction of movement within the EU zone and among the member states of the Schengen agreement.

Their comments came a day before EU ministers will discuss suspending the Schengen passport-free travel zone for two years, on the basis that the migrant crisis has exposed "serious deficiencies" at the Greek border that endanger the overall area, according to the Financial Times. (Yonhap)