The leader of the self-proclaimed "Luhansk People's Republic", Valeriy Bolotov, is expected to declare martial law on the territory of the "self-proclaimed state" starting from 1100 local time on May 22.

"Valeriy Bolotov will make a statement declaring martial law in the Luhansk People's Republic," Bolotov's spokesman Volodymyr Inohorodskykh told Interfax.

"Martial law will be in force starting from May 22 and until the Kyiv authorities withdraw their troops from the territory of the Luhansk People's Republic," he said.

The "Luhansk People's Republic" has been living under curfew since May 3, he added.