"According to the main department of defense and mobilization planning of the General Staff of the Ukrainian Armed Forces, the first stage of the fourth wave of mobilization is 90% implemented," she said.

"The second phase of the fourth wave of mobilization is now beginning," Kushnir said.

As UNIAN reported earlier, the first wave of the current mobilization into the ranks of the Ukrainian Armed Forces started on January 20 and will last for 90 days. In this period more than 60,000 people are to be mobilized.

In general, the mobilization in 2015 will be conducted in three stages, from January to August. The second and third stages will begin in April and June and will both last 60 days.

More than 200,000 Ukrainians are to be mobilized into the Ukrainian armed forces this year.

Ukrainian President Petro Poroshenko on Monday said the size of the Ukrainian armed forces would be increased to 250,000, partly through the mobilization of civilians.