"We expect that we will have enough people capable of defending their motherland," Syrskyi said. "I am talking not only about the mobilized but also about volunteer fighters."
Russian investigators claim gunmen behind concert hall attack had ties to Ukrainian nationalists. US dismisses allegations, blaming Islamic State.
Ukrainian officials regularly urge their Western allies to supply more air defense systems and munitions to thwart increasing Russian missile and drone attacks.
The Houthis have vowed to continue their attacks in the Red Sea as long as Israel continues to commit "crimes against Palestinians."
The meetings come as Pyongyang seeks to expand its diplomatic engagement after COVID-19 lockdowns.
The Moscow court said Shtein, who served as a Moscow municipal deputy until 2022, would begin her sentence once she could be extradited to Russia.
Islamic State has claimed responsibility for the massacre and US officials say they have intelligence showing it was carried out by the network's Afghan branch, Islamic State Khorasan.