The General Staff of the Armed Forces of Ukraine called on Ukrainians and foreigners to observe the rules of movement in the areas of hostilities due to recorded cases of unauthorized entry into such areas, in particular, in Sumy region.

"There are cases of unauthorized penetration of individuals into the areas of hostilities. This may affect the security measures of the use of troops [forces], which will create an additional threat to the lives of both our military and civilians," the General Staff reported on the Telegram channel.

"We call on citizens of Ukraine and foreigners to observe the established rules of movement in the areas of hostilities, including in the twenty-kilometer border zone of Sumy region," the message says.