Polish Prime Minister Donald Tusk has vowed to shoot down encroaching Russian aircraft as tensions flare between Nato members and Moscow.
Russian drones and warplanes have already entered the airspaces of both Poland and Romania, with three MIG-31 jets also entering Estonia last Friday.
In a press conference earlier today, Mr Tusk said: "I want to be very clear.
"We will make a decision to shoot down flying objects without discussion when they violate our territory and fly over Poland. There is no room for debate here."
The Polish premier added that he wants to have "100 per cent certainty" that Nato member states will defend Warsaw over potential incursions.
"If the conflict enters a very acute phase, we will not be alone," Mr Tusk said.
However, Warsaw is also looking to change its strategy when it comes to combatting incursions from Russian aircraft.
Estonian Prime Minister Kristen Michal went further, admitting that Tallinn could invoke Nato's Article 4, which calls for discussions among allies over threats to territorial security.
Polish PM Donald Tusk sent his warning to Russia earlier today
| GETTYForeign Secretary Yvette Cooper is also talking tough on how Britain plans to respond to Russia.
Speaking at the UN Security Council in New York earlier today, Ms Cooper said: “They are a deliberate attempt to undermine the territorial integrity of sovereign nations and European security.
“They risk miscalculation. They open the door to direct armed confrontation between Nato and Russia.”
She added: “Our alliance is defensive, but be under no illusion, we stand ready to take all steps necessary to defend Nato’s skies and Nato’s territory.
Vladimir Putin continues to face global backlash to his war in Ukraine | REUTERS“We are vigilant. We are resolute. And if we need to confront planes that are operating in Nato airspace without permission, then we will do so.”
RAF Typhoon jets have already taken part in Eastern Sentry, flying their first mission over Poland late on September 19.
The UN Security Council met earlier today to discuss Russia's recent incursions.
Nato members will tomorrow come together as part of the consultation process on the matter.
PICTURED: Nato members - who makes up the alliance? | GB NEWSHowever, the Kremlin has rejected concerns expressed by Nato member states.
Russia's deputy ambassador to the UN, Dmytry Polyanskiy, said there was no evidence backing their claims and accused European powers of levying "baseless" accusations.
He added: "We won't be partaking in this theater of the absurd.
"When you decide that you want to engage in a serious discussion about European security, about the fate of our common continent, about how to make this continent prosperous and secure for everybody, we'll be ready."