At least four people have been killed and ten injured in recent attacks along the border between Russia and Ukraine. On Friday, two women, an elderly man, and a toddler were killed in Sumy region after a drone hit a residential apartment building, as stated by Oleh Hryhorov, head of the regional military administration. In Kryvyi Rih, a central city in the Dnipropetrovsk region, seven people were injured in a missile attack, according to Oleksandr Vilkul, head of the city's defense council, who also reported that nine apartment blocks, a school building, several shops, garages, and about ten vehicles were damaged. Kryvyi Rih, the hometown of Ukrainian President Volodymyr Zelenskyy and a major industrial center, has been repeatedly attacked during the war. These attacks occurred a day after Moscow launched a series of deadly attacks on Kyiv, resulting in at least 30 casualties according to authorities. A day of mourning is being observed in Kyiv following the deadliest Russian attack on the Ukrainian capital this year. The United Nations Secretary-General Antonio Guterres has condemned Russia's barrage and called for an immediate ceasefire, while the Kremlin has pledged to escalate pressure on Kyiv. Ukraine's air force reported shooting down 476 out of 496 drones and 48 out of 74 missiles launched by Russia. The European Union's top diplomat Kaja Kallas proposed new sanctions against Moscow over the attack, while Zelenskyy vowed his forces would retaliate for the attacks on Wednesday and Thursday. Meanwhile, a woman died in Russia's western city of Belgorod due to shrapnel injuries, and water and power supplies were disrupted. An industrial facility also caught fire in Belgorod following Ukraine's missile attack, while a man died and a fire broke out at an industrial site in the Smolensk region after a drone attack, though no injuries were reported. Ukraine has been targeting Russia's energy infrastructure for months to cripple Moscow's military might, leading to fuel shortages across Russia. Putin has claimed that these attacks aim to create discord among the public.