Russia said on Monday it was battling a cross-border incursion by saboteurs who burst through the frontier from Ukraine, in what appeared to be one of the biggest attacks of its kind since the war began 15 months ago.
The governor of Russia's Belgorod region, Vyacheslav Gladkov, said a Ukrainian "sabotage group" had entered Russian territory in the Graivoron district bordering Ukraine and was being repelled.
