In a troubling escalation of hostilities, at least four people have been killed and ten injured in Russia's latest attacks on Ukrainian border regions, marking a significant surge in violence. On Friday, two women, an elderly man, and a toddler were killed in the Sumy region when a Russian drone struck a residential apartment building. Separately, a missile attack in Kryvyi Rih, Dnipropetrovsk region, left seven injured. This comes just a day after Moscow launched its deadliest series of attacks on Kyiv this year, resulting in at least 30 casualties. The Russian onslaught has led to a day of mourning in the capital city. United Nations Secretary-General Antonio Guterres strongly condemned these attacks and called for an immediate ceasefire. Meanwhile, Ukraine's air force reported success in intercepting a large number of drones and missiles launched by Russia. As the war continues, Ukrainian President Volodymyr Zelenskyy vowed retaliation for the recent attacks, accusing Russian President Vladimir Putin of preparing a massive strike against Ukraine over an extended period. Meanwhile, industrial sites in Russia's border regions have also suffered damage from Ukrainian drone attacks, further straining relations between the two nations. The European Union is considering imposing new sanctions on Moscow in response to these attacks.