"President Trump and the White House are monitoring reports from Poland. President Trump plans to speak with President Nawrocki today," the official said. <br><br> Poland shot down drones in its airspace on Wednesday with the backing of military aircraft from its NATO allies, the first time a member of the Western military alliance is known to have fired shots during Russia's war in Ukraine. <br><br> Polish Prime Minister Donald Tusk told parliament it was "the closest we have been to open conflict since World War Two", although he also said he had "no reason to believe we're on the brink of war". <br><br> Moscow denied responsibility for the incident, with a senior diplomat in Poland saying the drones had come from the direction of Ukraine. <br><br> European leaders, who have lately been trying to persuade Trump to join them in tightening sanctions on Russia and boosting support for Kyiv, said it justified a collective response. There was no immediate response from Washington. <br><br> <h2>‘Large-scale provocation’</h2>