COPENHAGEN – Europe must take a more aggressive approach with Russia by shooting down drones that enter European airspace and boarding shadow fleet ships illicitly transporting oil to deprive Moscow of war revenue, French President Emmanuel Macron said on Thursday.

Speaking at a European summit in Copenhagen, Macron and other European leaders called for more sanctions against Russia — notably targeting its energy sector — and emphasized that Ukraine is on the front line in a widening hybrid war against Europe.

Macron urged the more than 40 leaders at the European Political Community summit to simply protect their interests without signaling their intentions to Russia.

“I think the main answer should be more unpredictability and more strategic ambiguity,” he said.

“It’s very important to have a clear message: drones which would violate our territories are just taking a big risk. They can be destroyed, full stop,” he said. “We are not here to provide the full notice. We will do what we have to do.”

Macron pointed to a decision by French authorities to stop an oil tanker on the European Union’s shadow fleet sanction list, and detain two of its crew, as an effective way to act. Naval experts believe the ship may have been involved in drone flights over Denmark.

He said that Russia finances “30 to 40% of the war effort” via the shadow fleet.

Macron said that by seizing the ships, for a week or two, “we completely break the efficiency of the organization. So the shadow fleet is a very good target if you want to improve our efficiency to reduce these capacities.”

He said that the same ship was checked by Estonian authorities in March.

Danish Prime Minister Mette Frederiksen, who hosted the summit days after a series of drone incidents at Denmark’s airports and military bases, said: “It must be clear to everyone now, Russia will not stop until they are forced to do so.”

Russia, she said, is “a threat not only to Ukraine but to all of us. Today, we have one major task ahead of us. We have to make our common Europe so strong that the war against us becomes unthinkable, and we have to do it now.”

Frederiksen warned her partners that Europe “can no longer be naive. The war was never just about Ukraine. It is about Europe. All our nations, all our citizens, our values and our freedom.”

Polish Prime Minister Donald Tusk urged the leaders to abandon any “illusions” they might have about Russia’s intentions. He said that Poland has been a constant victim of Russian intimidation, most notably a major drone intrusion last month.

Poland has since vowed to shoot down Russian drones that enter its airspace.

“The first illusion was, and is, that there’s no war,” Tusk said, referring to those who talk about the war in Ukraine as a “full-scale aggression” or use other euphemisms. “No. It’s war. A new type of war. Very complex, but it’s war.”

Another illusion, Tusk said, is “that it is impossible for Ukraine and for all of us to win this war. It’s absurd. The only Russian advantage, the only one, is mentality. We are much bigger than them,” in terms of economic might and population, he said.

Tusk, whose country borders Belarus and Ukraine, added: “We know that if they win against Ukraine, it is also in the future the end of my country and of Europe. I have no doubts.”

U.K. Prime Minister Keir Starmer said that it was important to ramp up economic pressure on Russian President Vladimir Putin.

“The economic pressure is having an effect, and we need to continue that. Pressure through further sanctions, bearing down on energy in particular, and on the shadow fleet,” Starmer said before leaving the summit early to return to the U.K. in the aftermath of an attack outside a synagogue in Manchester, England.

It’s also vital to put “Ukraine in the strongest possible position, and that then means more on air defenses, more on long-range (missiles) and anti-drone” capabilities that must be sent to the country, now in the fourth year of war.