Kyiv, Ukraine CNN  — 

Two large explosions lit up the night sky south of the Ukrainian capital of Kyiv early Sunday morning.

The explosions appear to have been around Vasylkiv, which has a large military airfield and multiple fuel tanks and is about about 30 kilometers south of Kyiv.

The latest development comes after Ukraine’s outgunned forces held the capital for the third day on Saturday as battles continued across the country, while a defiant Ukrainian President Volodymyr Zelensky told citizens to defend the country.

A blast lit up the skyline on Saturday night in the strategic maritime city of Mykolaiv in southern Ukraine as heavy shelling reverberated around