Zelenskyy said Russian strikes on civilian infrastructure intensified after Putin ordered the removal of earlier constraints, as Moscow warned it could use its full arsenal against a direct attack.

Russian President Vladimir Putin has ordered his military leadership to drop restrictions that previously governed air campaigns in Ukraine, Ukrainian President Volodymyr Zelenskyy told the Financial Times, citing intelligence intercepted by Kyiv.

Zelenskyy made the claim while speaking from a school bomb shelter that had just been struck by a Russian jet-powered drone. He said Ukrainian intelligence agencies had obtained intercepted communications involving Kremlin officials indicating that Putin had removed the constraints previously imposed on Russian air operations.

“He said there are no rules now,” Zelenskyy said, referring to the intelligence that included intercepted communications from Kremlin officials.

According to Zelenskyy, the order was issued in September as Russia stepped up its aerial attacks on Kyiv. He said the strikes had targeted civilian infrastructure including schools, hospitals and data centres. Russia also struck Ukraine’s National Academy of Sciences in central Kyiv and one of the capital’s main bridges this week.

The claims came as tensions between Russia and European countries also intensified over alleged hybrid attacks and Moscow’s warnings about a possible confrontation with Nato.

German Chancellor Friedrich Merz said on Thursday that Europe was preparing for a “severe” campaign of Russian hybrid attacks. Putin, meanwhile, confirmed that Russia’s Foreign Ministry had issued warnings to several countries and said Moscow would consider using all weapons available to it if Russia came under direct attack.

The exchange followed warnings from Belgium’s Defence Minister Theo Francken, who said Europe could face a “dark winter” because of Russia’s continuing hybrid campaign. Danish intelligence has also warned that Russia could potentially launch a limited military attack against a Nato member in the coming months.

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Putin reiterated on Thursday that Russia does not intend to attack European countries but would respond to any aggression with its full arsenal.

In remarks at a foreign policy forum, Putin accused the West and Europe of escalating tensions by talking about preparing for a war with Moscow in the coming years, conducting military drills in the Baltic Sea, and seizing Russian vessels.

His remarks followed Moscow’s warning to Nato that it would not hesitate to use nuclear weapons to defend Kaliningrad should any members of the military alliance try to cut off the Baltic exclave from the rest of Russia.

Several Russian embassies in Europe this week issued statements that said Moscow has “information that Nato is preparing (an) air and naval blockade of Kaliningrad and (the) Kaliningrad region.”

They accused European leaders of “playing a dangerous game” by saying Russia might attack another country or ramp up a campaign of destabilising attacks with drones and sabotage. Moscow has called the allegations absurd.

“There should be no mistake — Russia would be ready to use all its arsenal, including nuclear weapons, to defend its territory if Nato countries try to isolate (the) Kaliningrad region from the rest of the country,” the Russian Embassy in Ireland said in its statement on Tuesday.

Asked at the Valdai Club forum Thursday whether Russia was on the cusp of a war with Nato or whether both were trying to intimidate each other, Putin said: “It’s not intimidation, it’s a response to an attempt to intimidate us.”

Putin said that “everything is written correctly” in the earlier warning to Nato.

“If it comes to a direct attack on the Russian Federation — in this case we mean Kaliningrad, or maybe some other territories — of course, inevitably and immediately the question of the Russian Federation using all weapons at the disposal of our country will appear on the agenda,” he said.

Putin didn’t specify whether Moscow would use nuclear weapons but said it has arms that “no one else has” and would determine which to use in case of an attack.

Nato pushed back against Russian nuclear rhetoric

Nato spokesperson Allison Hart confirmed Wednesday that Russia had sent a written message to the U.S.-led military alliance. “We strongly denounce the threat of force, including any irresponsible nuclear rhetoric,” she said in a statement.

Hart insisted Nato is not targeting Kaliningrad and had sent a reply noting that “Nato is a defensive alliance and none of our activities or exercises pose a risk to any part of Russia.”

Nato Secretary-General Mark Rutte said Wednesday the bloc’s response to the message was “short and concise.”

“Basically what we said is, ‘Hey, listen, we are defensive alliance, and stop the nuclear threat. This is absolutely not called for and not helpful,’” Rutte told Euronews.

Nato’s response also urged Russia to stop its “unprovoked war of aggression against Ukraine,” now in its fifth year.

The Baltic exclave of Kaliningrad sits between Nato members Poland and Lithuania. It is home to Russia’s main Baltic navy base and other military assets, and nuclear-capable Iskander missiles are deployed there.

Western military officers have said that key military installations in Kaliningrad would be a likely first target should Russia ever attack any Nato ally.

Nato allies have conducted military exercises in the Baltic Sea region in recent months. More are planned in October. It launched Operation Baltic Sentry there last year to protect communication cables and pipelines.

On Aug. 18, Nato held an exercise over northern Poland and the Baltic region involving several aircraft, including an EA-37B Compass Call — a sophisticated American plane that can jam communications and radar, the U.S. Air Forces in Europe said.

Defence analysts believe the unannounced, large-scale exercise would not have been welcomed by the Kremlin.

With inputs from agencies