Ukrainian President Volodymyr Zelenskyy said he was sending a Ukrainian delegation to Istanbul for another face-to-face with Russian representatives.

Ukrainian drones hit several Russian strategic airfields, including the Belaya military base deep in eastern Siberia, while Moscow launched one of its longest drone and missile attacks against Kyiv, escalating tensions ahead of crucial peace talks this week.

A Ukrainian security official says a drone attack has destroyed more than 40 Russian planes deep in Russia’s territory.