Russian forces advancing towards the Ukrainian capital

Satellites have captured images of a massive convoy of Russian military vehicles 40 miles long (65 kilometers) nearing the besieged Ukrainian capital Kyiv as the country continued its resistance against Russian invasion.

According to a report by Reuters, Air raid sirens were sounding in Kyiv in the early hours of Saturday morning, and there were reports of heavy shelling.

Russian forces bombarded cities across the country on Friday and appeared to be regrouping for a possible assault on Kyiv as Ukrainian president Volodymyr Zelenskiy said his country had reached a “strategic turning point” in the conflict.

Meanwhile, CNN teams in Kyiv reported hearing explosions in the early hours of Saturday morning, with chief international correspondent Clarissa Ward describing "a nonstop volley ... of just heavy booms in the distance," continuing for several minutes.

However, a CNN reporter said it was unclear whether the explosions were Russian or Ukrainian strikes.