The UK has summoned the Russian ambassador in London following the country’s “unprecedented violation” of Nato airspace.
The Foreign Office said the incursions into Polish and Romanian airspace were “utterly unacceptable”.
Andrei Kelin, Russian President Vladimir Putin’s man in London, has been summoned by the department.
A spokesperson said: “Significant and unprecedented violation of Polish and Nato airspace by Russian drones last week, followed by a further incursion into Romanian airspace on Saturday, was utterly unacceptable.
“The UK stands united with Poland, Romania, Ukraine and our Nato allies in unreservedly condemning these reckless actions.
“As our continent once again faces the egregious expansion of Russia’s reckless behaviour, defence of Ukraine against Putin’s aggression is crucial to the security of the whole of Europe, including the UK.
They added: “Russia should understand that its continued aggression only strengthens the unity between Nato allies and our determination to stand with Ukraine, and any further incursions will again be met with force.
“Russia must end its illegal war on Ukraine.”
