Ukraine’s military has launched a surprise cross-border offensive in Russia’s Kursk region, where there are reports of fierce fighting. Before Ukraine’s renewed offensive, Russia had retaken much of the territory Ukraine seized when it first invaded Kursk last August. On Sunday, one person was killed and another wounded when Russian forces shelled the city of Nikopol in southeastern Ukraine. Further south, at least eight people were wounded when Russian troops shelled the city of Kherson. Meanwhile, Russia has vowed to retaliate after it said it shot down eight U.S.-supplied ATACMS missiles fired by Ukraine at the Russian region of Belgorod. Russian President Vladimir Putin previously threatened to respond to such attacks using Russia’s new nuclear-capable hypersonic ballistic missile.