KYIV (AFP) — Russian and Ukrainian forces fired dozens of drones at each other early Tuesday, killing a 12-year-old girl in Ukraine and two people in a Russian border region, authorities said.

The attacks came less than two days into a week the United States (US) warned would be “critical” for the peace process and as US officials threaten to abandon their push for a ceasefire if they do not see progress soon.

Russian strikes on Ukraine have killed dozens of people over the past month, including in the capital Kyiv, while hostilities on the front line have shown no signs of abating.

Russian President Vladimir Putin on Monday declared a three-day truce in May to coincide with Moscow’s World War II commemorations.

Ukrainian leader Volodymyr Zelensky said this was only intended for Putin to “have silence” during Moscow’s 9 May military parade and demanded an immediate ceasefire.

Russia fired 100 drones at Ukraine between late Monday and early Tuesday, the Ukrainian air force said.

“The enemy attack led to a tragedy. In Gubynykha, in the Samar district, a 12-year-old girl died,” the governor of Ukraine’s central Dnipropetrovsk region, Sergiy Lysak, wrote on Telegram.

Gubynykha is around 140 kilometers west of the front line.

“A six-year-old girl and two adults were injured,” he added.