NATO jets were scrambled on Friday after Russia “brazenly” entered Estonia's airspace in a major escalation by Vladimir Putin’s forces.
The Estonian government summoned a Russian diplomat to protest after three Russian fighter planes entered its airspace without permission.
Speaking late last night, US President Donald Trump warned that Russia’s violation of Estonia’s airspace could cause “big trouble.”
Speaking from the Oval Office, Mr Trump said he was “going to have a look” at the reports.
“They're going to be briefing me in a short while, so I'll let you know about it tonight or tomorrow,” he said.
Asked for his take on the situation, the president added: “Well, I don't love it. I don't love it when that happens. Could be big trouble.”
It comes after Russian drones were shot down in Poland and spotted in Romania amid heightened fears that the war in Ukraine could spill over.
According to the country’s foreign ministry, three Mikoyan MiG-31 interceptor aircrafts flew near Vaindloo Island in the Gulf of Finland for a total of 12 minutes.
Such jets are capable of carrying deadly Kinzhal hypersonic missiles, which can reportedly reach speeds of up to 7,000 mph.
A NATO spokesman said the alliance “responded immediately and intercepted the Russian aircraft" using Italian Air Force F-35 II stealth planes.
Foreign Secretary Yvette Cooper said the UK "stands with" Estonia following the incident.
She said: "The UK stands with our Estonian allies following yet another reckless incursion into Nato airspace by Russia.
"We must continue to increase pressure on Putin, including driving forward the important new economic sanctions announced by the UK & EU in recent days."
EU high representative for foreign affairs Kaja Kallas described the incident as a "extremely dangerous provocation" which "further escalates tension in the region", and warned that Russian President Vladimir Putin was "testing the West's resolve".
The incursion came 10 days after Russian drones entered Polish air space and six days after another Russian drone was intercepted flying over Romania.
The incident over Poland prompted Prime Minister Donald Tusk to warn that his country was the closest to "open conflict" it had been since the Second World War, while the UK announced it would provide Warsaw with extra air cover in the form of RAF jets.
Defence Secretary John Healey said: "This is yet another edition of the Putin playbook. Russia's latest reckless and dangerous activity is the third violation of Nato airspace in recent days.
"But Putin's aggression only serves to strengthen the unity of Nato and our resolve to stand with Ukraine.
"We are stepping up within Nato to contribute fighter jets to the new Eastern Sentry mission, strengthening Nato air defence on our eastern flank.
"And we continue to support Estonia closely, including through our deployment of around 1,000 UK armed forces personnel under Operation Cabrit."
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