Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Zelenskyy to Address G7 Leaders After Russian Missile Attack on Kyiv, Other Cities by VOA News Ukrainian President Volodymyr Zelenskyy is due to address the leaders of the Group of Seven nations during a virtual meeting Tuesday that follows a series of deadly Russian missile strikes on Ukraine's capital and other cities located across the country. Hours before the meeting, Ukraine's State Emergency Service reported multiple fresh missile strikes in Zaporizhzhia that killed at least one person. Air raid sirens sounded in Kyiv and other areas. The mayor of Lviv said a missile strike there disrupted power and water services. Ravina Shamdasani, a spokesperson for the U.N. human rights office, told reporters Tuesday that Russia's strikes "may have violated the principles of the conduct of hostilities under international humanitarian law," "Intentionally directing attacks against civilians and civilian objects, that is objects which are not military objectives, amounts to a war crime," she said. Ukrainian Foreign Minister Dmytro Kuleba said Russia is targeting energy facilities by design. "These are war crimes planned well in advance and aimed at creating unbearable conditions for civilians -- Russia's deliberate strategy since months," Kuleba tweeted. Zelenskyy said Monday that Ukraine "cannot be intimidated," and rather than instill fear, Russia's attacks made "the whole world take notice." "We will do everything to strengthen our armed forces," Zelenskyy said. "We will make the battlefield more painful for the enemy." The Ukrainian leader tweeted after a phone call with U.S. President Joe Biden that air defense was his top priority, and that he was looking to the United States for leadership on a "tough stance" from the G-7 as it considers its response to Russia's attacks. Biden and Western allies were quick to condemn the attacks and vowed to continue to send military aid to Ukraine's forces to help fend off Moscow's invasion, now in its eighth month. A White House statement said Biden told Zelenskyy the United States would provide advanced air defense systems. Biden said in a statement earlier Monday that Russia's latest missile launches "once again demonstrate the utter brutality of Russian President Vladimir Putin's illegal war on the Ukrainian people. "These attacks only further reinforce our commitment to stand with the people of Ukraine for as long as it takes," he said. "Alongside our allies and partners, we will continue to impose costs on Russia for its aggression, hold Putin and Russia accountable for its atrocities and war crimes, and provide the support necessary for Ukrainian forces to defend their country and their freedom." Russian Ambassador to the United States Anatoly Antonov told reporters that more Western military aid for Ukraine risked further escalation and a possible clash between Russia and NATO. Ukraine's State Emergencies Service said Monday's attacks killed at least 19 people. The Ukrainian military said the barrage included 84 cruise missiles and 24 drones. Most of the attacks on Kyiv hit the center of the city, including parks and tourist sites. Putin told a meeting of his security council Monday that the strikes were in response to an attack Saturday on a bridge linking Russia to Crimea, the Ukrainian peninsula Moscow illegally seized in 2014. "It is obvious that the Ukrainian secret services ordered, organized and carried out the terrorist attack aimed at destroying Russia's critical civilian infrastructure," Putin said. Ukraine has strongly suggested its security agents carried out the truck bomb attack on the bridge but has not publicly claimed responsibility. The bridge has been a major supply route for Russian operations in southern Ukraine. Putin said any continued "terrorist attacks" by Ukraine on Russia would be met with a "tough and proportionate" response. Kyiv was last attacked in June. Once under pressure from advancing Russian forces, Kyiv had been relatively calm for months as fighting raged in eastern and southern Ukraine. Some information for this story came from The Associated Press, Agence France-Presse and Reuters.