Ukrainian attacks on holiday camps in the partly Russian-occupied Zaporizhzhia region have killed 12 people, while authorities in Ukraine’s northeastern Sumy region said a Russian drone strike killed three people there.

The strikes followed a major Russian attack near Kyiv yesterday that killed at least 10 people and injured around 100 others. The continuing exchange of attacks has further dimmed hopes of a diplomatic resolution to Russia’s more than four-year-long invasion of Ukraine.

The latest developments come as Ukraine’s drone attacks have slowed Russian military advances and targeted key infrastructure inside Russia, causing fuel shortages and increasing pressure on Russian President Vladimir Putin.

The Kremlin-appointed head of the Zaporizhzhia region, Yevgeny Balitsky, said four children were among the 12 people killed in the attack on the holiday camps. He added that 19 others were injured.

Meanwhile, Sumy regional governor Oleh Hryhorov said three people were killed when a Russian drone struck a civilian facility, triggering a large fire. He said the victims were drivers working for the private Ukrainian postal and courier company Nova Poshta.

In his evening address yesterday, Ukrainian President Volodymyr Zelenskyy said intelligence assessments indicated that Russia was preparing missiles for a large-scale attack, adding that there were indications it could take place within the next 48 hours.