The Russian invasion of Ukraine is in its third day, with fighting and blasts reported in the capital Kyiv.

Ukraine crisis: Russia attacks Kharkiv

Ukraine crisis updates: What to know amid the fears of war

Only half an hour into 2023, air raid sirens rang across Ukraine's capital followed by the sound of explosions

Defence and security analyst Michael Clarke explains the current situation on the ground in Ukraine, as Putin's forces seize control of the former Chernobyl nuclear power plant near Pripyat.