Russia has urged Poland to reopen its border with Belarus, Moscow's close ally, calling the closure "destructive" and warning of consequences.
It comes as Poland said the UN Security Council will hold an emergency meeting to discuss drone incursions into its airspace which the Polish president described as an attempt by Russia to test Warsaw and NATO's response.
Poland also banned drone flights along its eastern borders with Belarus and Ukraine, and limited small air traffic there, after shooting down what it said were Russian drones that violated its airspace yesterday.
"We urge Warsaw to consider the consequences of such destructive steps and to review its decision as soon as possible," Russian foreign ministry spokeswoman Maria Zakharova said in a statement this evening, after Poland decided to close the border with Belarus over its joint drills with Russia.
Poland was backed by its NATO allies in shooting down the drones yesterday - the first time a member of the military alliance is known to have fired shots during Russia's war in Ukraine - and Germany said today it would strengthen its commitment to NATO's eastern border in response to the incursions.
Russia said it had not intended to hit any targets in Poland, and that it would make no further comment on the incident. A senior NATO commander said it was not yet known whether the drone incursions were intentional.
But the incident has raised questions about NATO's preparedness against drone attacks, fuelled tensions with Russia and prompted some Western leaders to seek new sanctions against Moscow and question its commitment to peace efforts in Ukraine.
"This Russian provocation, as the generals and our soldiers are well aware, was nothing more than an attempt to test our capabilities, our ability to respond," Polish President Karol Nawrocki told soldiers today.
The Polish foreign ministry said the United Nations Security Council would meet at Warsaw's request but did not say when.
The UN did not immediately comment, but Slovenia, Denmark, Greece, France and Britain have asked the Security Council to meet tomorrow, diplomats said yesterday.
Polish F-16 fighter jets, Dutch F-35s, Italian AWACS surveillance planes and NATO mid-air refuelling aircraft scrambled in the operation to shoot down drones in Polish airspace overnight on Tuesday to Wednesday, officials said.
The debris of 16 drones had so far been recovered, Defence Minister Wladyslaw Kosiniak-Kamysz told parliament today.
He said Poland's logistical support for Ukraine may have been a motivation for the incursions - most aid for Ukraine transits via Poland.
"This is an attempt to weaken NATO's and Poland's willingness to support Ukraine," he said.
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United front after Russian drones over Polish skies
Behind the Story: Is Russia testing NATO with drones in Poland?
Polish Prime Minister Donald Tusk said yesterday he had activated Article 4 of NATO's treaty, under which alliance members can demand consultations with their allies.
US President Donald Trump spoke to Mr Nawrocki yesterday, and the leaders expressed unity. But Washington said little about the drone incursions on the eve of a prisoner release by Belarus that followed an appeal by the US president.
European leaders, who want Mr Trump to join them in tightening sanctions on Russia and boosting support for Kyiv, said the airspace violations justified a collective response.
Germany said it would intensify support for Ukraine and work within the European Union towards the swift adoption of more sanctions against Russia following the drone incursions.
"In addition to existing commitments in the Baltics and Poland, the government will extend and expand air policing over Poland," a German government spokesperson said.
The Netherlands is sending 300 soldiers and accelerating deployment of two out of three Patriot air defence batteries promised to Poland, and the Czech Republic could send three helicopters and 100 soldiers, Poland's defence minister said.
Politicians from three Baltic nations bordering Russia urged the US Congress to reject a proposal by Mr Trump that would slash about $200m a year in defence support for the region.
"In this region, if America goes out, Russia comes in," said Zygimantas Pavilionis, Lithuania's former ambassador to the US.
Neither Poland nor NATO has yet given a full account of what they suspect the drones were doing. NATO also faces questions about whether foreign drones should even be able to enter its airspace and how well equipped it is to deal with such threats.
