An aircraft carrying European Commission President Ursula von der Leyen was allegedly hit by Russian GPS jamming on its way to Bulgaria, the commission said Monday.

"We can confirm there was GPS jamming but the plane landed safe," a commission spokeswoman said about the Sunday incident. "We have received information from Bulgarian authorities that they suspect this blatant interference was carried out by Russia."

"We are well aware that threats and intimidation are a regular component of Russia's hostile actions," the spokeswoman added.

"This will further reinforce our unshakable commitment to ramp up our defence capabilities and support for Ukraine."

Von der Leyen was travelling to Bulgaria on Sunday on a charter flight.