Poland warned on Wednesday that Russia and Europe are inching towards an "open conflict" after Warsaw shot down what it said were Russian drones in Polish airspace, drawing vows of support from the United States and other Nato members.

Russia denied targeting Poland, while US President Donald Trump called out the Kremlin for "violating" the Nato ally's territory as Moscow unleashed its latest attack on Ukraine.

Ukraine's president and the European Union called the drone move a test of the alliance's resolve.

Footage posted by local media showed the army in Wyryki-Wola, a village in eastern Poland, inspecting a house with its roof ripped open and debris littered nearby.

"We were just sitting there, and this plane flew over... I said to my husband: 'Why is this plane so loud today?' And suddenly, a bang, and that was it," Alicja Wesolowska, 64, whose house was destroyed, told AFP in Wyryki-Wola.

Authorities said nobody was harmed after Poland's airspace was violated 19 times. Prime Minister Donald Tusk said at least three drones were shot down after Warsaw scrambled jets with the backing of aircraft from its NATO allies.

It was the first time a member of the Western military alliance is known to have fired shots during Russia's war in Ukraine.

Tusk warned the situation risked boiling over, and called urgent talks with NATO.

Trump, who warned at the weekend that he was ready to impose more sanctions on Moscow, wrote on his Truth Social platform: "What's with Russia violating Poland's airspace with drones? Here we go!" without elaborating.

Polish Foreign Minister Radoslaw Sikorski said the intrusion was not accidental and branded it "an unprecedented case of an attack" on Poland, Nato and the European Union.

But Russia's defence ministry denied targeting Poland, while Moscow's foreign ministry accused Warsaw of spreading "myths" to escalate the war in Ukraine.

Russian drones and missiles have entered the airspace of Nato members, including Poland's, several times, but a Nato country has never attempted to shoot them down.

Tusk said he had invoked Nato's Article 4, under which a member can call urgent talks when it feels its "territorial integrity, political independence or security" are at risk – only the eighth time the measure has been used.

"This situation... brings us closer than ever to open conflict since World War II," Tusk told parliament.

He however said that there is "no reason today to claim that we are in a state of war".

The incident came as Russia unleashed its latest barrage of strikes across Ukraine.

Ukrainian President Volodymyr Zelensky said the airspace violation was a "dangerous precedent" and urged a strong response from Kyiv's allies.

"The Russians are testing the limits of what is possible... They are recording how the armed forces of Nato countries act," he said in his daily address.

Poland's interior ministry said 15 drones and debris from an unknown projectile had been located so far.

The leaders of France, Britain, Germany, and Canada were among the NATO leaders to condemn the suspected Russian incursion.

European leaders, who have been trying to persuade Trump to join them in tightening sanctions on Russia and boosting support for Kyiv, said it justified a collective response.

Slovenia, Denmark, Greece, France, and Britain have asked the United Nations Security Council to meet on Friday over what they deemed Russian violations of Polish airspace, diplomats said. (Agencies)