Ukraine war live updates: Suspects in Moscow concert terror attack appear in court; Kyiv rocked by explosions

This is CNBC's live blog tracking developments on the war in Ukraine. See below for the latest updates. 

Four men Russia says were involved in the deadly shootings at a concert hall on the outskirts of Moscow Friday night appeared in court late on Sunday.

The men were charged with committing an act of terrorism when they appeared in the Basmanny district court, accused of carrying out an attack in the Crocus City Hall concert venue in which 137 concertgoers were killed and at least 140 were injured. The Islamic State group has said it was behind the attack.

The suspects, three of whom confirmed as Tajik nationals, appeared in the Basmanny district court late last night, looking disheveled and disoriented. One of the suspects was wheeled into court while another had a bandage removed from his eyes, revealing a black eye.

The suspects, identified as Saidakrami Murodali Rachabalizoda, Dalerdzhon Barotovich Mirzoyev, Shamsidin Fariduni and Muhammadsobir Fayzov, will be detained in custody until May 22, pending trial, the court said on Telegram. They may face life in prison if found guilty.

Ukraine is keeping electricity imports high and not planning to export power on Monday after Russian attacks on the energy sector, the energy ministry said.

Russia attacked Ukrainian generating and transmission facilities last week and over the weekend, causing blackouts in many regions.

"For the current day, electricity imports are forecast at 14,887 megawatt hours (MWh). No exports are expected," the ministry said in a statement.

Ukraine imported 14,900 MWh on Sunday and 3,300 MWh a day before the first in the latest wave of attacks on its power sector on March 22.

Emergency power outages were introduced in Ukraine's port of Odesa on