Earlier, US President Donald Trump urged his European allies to take back over 800 terrorists captured in Syria and bring them to justice, warning that alternatively, Washington could be forced to release them.

German Foreign Minister Heiko Maas has lashed out at US President Trump's demand for European nations to repatriate jihadists, saying that "it is certainly not as easy as they think in America".

"German citizens have the right to return, but we have little ability in Syria at present to check whether German citizens are actually affected," he told reporters at a meeting of EU foreign ministers on Monday.

Maas added that the authorities would have to check to what extent these people were involved in fighting for Daesh*, which "would result in criminal proceedings having to be opened against them".

"These people can come to Germany only if it is ensured that they can immediately be taken into custody," he noted.

Austrian Federal Chancellor Sebastian Kurz, for his part, stressed that he shares the stance of France, Denmark and the UK on the matter and that "protection of our own population remains the highest priority, especially from those who are accused of serious crimes".

Belgian Foreign Minister Didier Reynders said that the country's government has always intended to bring back children under 10 whenever possible, while others would be dealt with on a "case by case" basis.

"In general, we deem it feasible to find a pan-European solution to this problem or a coordinated solution between the states that are most affected by it," he underlined.

French Justice Minister Nicole Belloubet pointed out that "for the time being" Paris is not changing its policy, saying that "at this stage France is not responding to [Trump's] demands".

Hungarian Foreign Minister Peter Szijjarto admitted that the issue is "one of the greatest challenges ahead of us for the upcoming months", but warned that "our major endeavour now should be not to allow them [jihadists] to come back to Europe".