Ukrainian border guards have denied over 8,000 people entry into Ukraine in line with Operation Cordon since March 4, Ukrainian State Border Service chief Mykola Lytvyn said.

"A total of 8,200 people have been denied entry since the start of the measures, including 200 people who have been denied entry over the past 24 hours alone," Lytvyn said at a press conference on Tuesday.

In addition, 77 writs denying some people entry have been issued since March 4, he said.

"Sixty-three people involved in extremist activities have been identified on the second line of control," he added.

The people denied entry to Ukraine are mainly citizens of Russia who "could have planned various provocations and extremist activities" on Ukrainian territory, he said.