Russia is more dangerous than Islamic State of Iraq and the Levant (Isil), the Polish foreign minister has warned, as he said its activity could destroy countries.

Witold Waszczykowski described Isil as a very serious threat but added that "it is not an existential threat for Europe".

"By all evidence, Russia's activity is a sort of existential threat because this activity can destroy countries," said Mr Waszczykowski, who was speaking in a debate on the future of Nato at the annual Globsec security forum in Bratislava.

"We also have non-existential threats like terrorism, like the great waves of migrants," he added, according to Poland's PAP news agency.

He called for Nato to approve the deployment of troops on the alliance's eastern border at its upcoming July summit due to be held in Warsaw.

"This will be a symbol of the determination to defend the eastern flank. We can discuss the scale of this deployment," he said.