The Nord Stream gas leak seen from a Danish defense aircraft at sea in Denmark on September 30.
European Union leaders will discuss the security of crucial infrastructure when they meet in Prague next week following damage to the Nord Stream pipelines that many in the West have said was caused by sabotage.
"Sabotage of Nord Stream pipelines is a threat to the EU," Charles Michel, who chairs meetings of EU leaders, said in a tweet on October 1 after talks with Danish Prime Minister Mette Frederiksen in Brussels.
“We are determined to secure our critical infrastructure. Leaders will address this at the upcoming summit in Prague," he wrote.
The leaders of EU member states leaders are scheduled to meet in the Czech capital on October 7.
Meanwhile, NATO Secretary-General Jens Stoltenberg also met with Frederiksen in Brussels "to address the sabotage” on the pipelines, he said on Twitter .
"NATO allies will continue our close cooperation on resilience [and the] protection of critical infrastructure," Stoltenberg wrote.
NATO earlier voiced "deep concern" over the damage sustained by the Nord Stream pipelines in the Baltic Sea, calling the incidents "deliberate, reckless, and irresponsible acts of sabotage."
Three leaks -- two in the Danish zone and one in the Swedish zone -- were discovered last week in the two major Russian underwater pipelines designed to ship natural gas to Germany, while Sweden on September 29 said its coast guard had found a fourth leak.
The incidents come amid rising tensions between Europe and Russia over the war in Ukraine.
While both NATO and the European Union say the leaks were caused by sabotage, they have so far refrained from directly pinning the blame on Russia.
Based on reporting by Reuters and dpa