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... The antennae are based, he said, in the heavily militarized territory of Kaliningrad, sandwiched between NATO alliance members Lithuania and Poland on the Baltic coast.

"The occasional interference began with the 2023 NATO summit in Vilnius. Now they have built up the infrastructure and the interference has become systemic, permanent, unending Russian provocation against European security," Kuliesius said.

The Russian embassy in Lithuania's capital Vilnius did not immediately reply to a request for comment, but Moscow has frequently denied such accusations in the past.

A map from the Lithuanian regulator indicated Russia's Global Positioning System falsification could reach across Estonia, Latvia and Lithuania, most of Poland, and parts of Finland, Sweden and Belarus, as well as the Baltic Sea.

The range had reached 450km, Kuliesius said, which the Lithuanian regulator estimated by analysing disturbances in aviation surveillance ADS-B transmissions.

PAST INCIDENTS

Last year, a Spanish military jet with Defence Minister Margarita Robles onboard experienced a GPS disturbance near Kaliningrad while a plane carrying European Commission President Ursula von der Leyen was jammed en route to Bulgaria.

Estonia and neighbouring Finland have also blamed Russia for jamming GPS navigation devices in the region's airspace. ...