A fresh travel warning has been issued to Britons by the Foreign Office after Poland shot down multiple Russian drones which "repeatedly violated" its airspace.
Polish, Dutch, American and Italian fighter aircraft scrambled to respond and intercept more than 10 "hostile" drones, with citizens told to stay at home.
Poland's airspace was temporarily closed while the jets were scrambled but was reopened around 7am this morning. Since then, the FCDO has updated its advice for Britons in Poland.
It said: "Poland's airports are open but there may be travel disruption," the FCDO stated.
"Follow official Polish Government announcements and updates from airlines."
The FCDO added that "Russian military strikes have taken place in Ukraine within 20 kilometres of the Polish border.
"Access to the border is restricted."
In giving a warning "before you travel", the FCDO outlined that "no travel can be guaranteed safe", along with a number of links for advice to female travellers, disabled, LGBT+, solo and volunteers travelling.
Fighter jets have been scrambled after Polish authorities were tipped off by the Ukrainian air force that drones from Russia were spotted entering their airspace
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Polish Armed Forces' Operational Command said on X it was "an act of aggression that has created a real threat to the safety of our citizens".
It added that the situation was continually monitored.
Poland's Defence Minister Wladyslaw Kosiniak-Kamysz said "more than 10 objects" crossed into Polish airspace.
However, he said they were neutralised despite it being a risk.
Three regions of eastern Poland were marked 'most vulnerable' during the Russian drone incursion | GB NEWS
New advice given by Chopin International Airport
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Poland closed four of its airports while the Nato jets were in the air, including its main Chopin Airport in Warsaw, the US Federal Aviation Administration reported.
Chopin Airport put out a statement early Wednesday morning, saying: "Due to the actions of state services and the military to ensure safety, the airspace over part of the country, including Chopin Airport, has been temporarily closed".
It added that the airport remained open, but "no flight operations are currently taking place".
However, a statement hours later indicated that Warsaw Chopin Airport had been reopened.
"Due to the situation related to the restrictions and prior closure of the airspace, disruptions and delays are to be expected, which may last throughout the day," the statement indicated.
"Please check the airport's website for the current flight status; detailed information is available directly from the airlines."
Meanwhile, Russian drone debris was found in the eastern Polish village of Czosnówka.
Poland's Prime Minister Donald Tusk said the country was considering invoking Nato's Article 4 clause to trigger consultation with its allies.
Poland and Nato allies stepped into action on Wednesday morning - but which countries make up the alliance? | GB NEWSIt is the standard starting point for large-scale Nato operations, but falls short of Article 5, providing mutual defence if a member state is attacked.
Ukraine Foreign Affairs Minister Andrii Sybiha said: "Russian drones flying into Poland during the massive attack on Ukraine show that Putin's sense of impunity keeps growing because he was not properly punished for his previous crimes."
"Putin just keeps escalating. Expanding his war, and testing the West. The longer he faces no strength in response, the more aggressive he gets," he added.
Mr Sybiha said that "a weak response" would "provoke Russia even more".
What is Nato's Article 4
Article 4 has been previously activated only seven times during Nato's 76-year history, each time coming in the 21st century.
Any member state can use it to initiate alliance-wide talks to respond to threats to its security or territorial integrity.
Poland and other European Nato members have twice used the article to prompt talks on how the alliance should respond to Russia's annexation of Crimea in 2014, as well as the full-scale Ukraine invasion in 2022.
Turkey invoked Article 4 the other five times.