Ukrainian President Volodymyr Zelenskyy and Belgian Prime Minister Alexander De Croo signed a declaration of support for Ukraine's membership to the European Union and NATO on Saturday during De Croo's working visit to Kyiv, CNN reported. 

Zelenskyy thanked Belgium for the joint declaration. He said this document testifies Belgium's support for our movement towards full membership in the European Union and NATO. 

The Ukrainian president also expressed his gratitude to Belgium for "being ready to provide the necessary power generators and other equipment that is now vitally necessary for Ukrainian society" in the wake of Ukraine's power outages after Russian missile attacks.

Sergey Kovalenko, chief operating officer of YASNO, which provides energy to Kyiv, said the situation in the city has improved but still remained "quite difficult." He indicated that residents should have at least four hours of power per day.

Zelenskyy on Friday criticized the mayor of Kyiv for doing what he said was a poor job setting up emergency shelters to help those without power and heat after Russian attacks. 

Russian President Vladimir Putin on Friday called on the Rostec state corporation to prioritize achievements in the defense industry during an event in honor of the 15th anniversary of Russia's high-tech state corporation Rostec.

"Since its founding, Rostec has been responsible for developing, producing and exporting high-technology products designed both for military and civilian purposes. There is a need not just to continue these efforts but to actively work in all promising areas that ensure Russia's technological sovereignty," Putin said.

(With input from agencies)