When a drone threat alert blared out in Lithuania's capital Vilnius urging residents to seek shelter, Rūta Gaškauskaitė hurried down to the nearest one, only to discover it was locked.

Squeezed between Russia and Kremlin-allied Belarus, Lithuania has been warning for years of the risks to Russia's Baltic neighbours.

But as Ukraine stepped up its retaliatory strikes on Russian oil hubs in the Baltic Sea and its drones were found straying across the region, the side effects of the war that it had been warning against caught Lithuania off guard.

The alert on 20 May for people to flee underground over a drone in Lithuanian airspace was the starkest reminder in years that emergency planning should be fully operational.

Gaškauskaitė found that it was not.