At least two Russian soldiers died and nearly three dozen were taken to intensive care after eating poisoned pastries offered by Ukrainian villagers, Ukraine's intelligence said on Sunday.
Residents of a village near the town of Izyum reportedly "treated" the troops of Russia's 3rd Motor Rifle infantry division to the traditional "pirozhki", which resemble a Cornish pastry, laced with an unknown poison.
The village recently became an epicentre of fighting as it sits on the road between the separatist-held areas and Ukraine's second-largest city of Kharkiv.
The Ukrainian military intelligence described the incident as an ingenious way to "offer resistance to the occupying troops by all possible means".