Prime Minister Boris Johnson said:
Russia's despicable attacks against innocent civilians in Irpin and Bucha are yet more evidence that Putin and his army are committing war crimes in Ukraine.
No denial or disinformation from the Kremlin can hide what we all know to be the truth - Putin is desperate, his invasion is failing, and Ukraine's resolve has never been stronger.
I will do everything in my power to starve Putin's war machine. We are stepping up our sanctions and military support, as well as bolstering our humanitarian support package to help those in need on the ground.
The UK has been at the forefront of supporting the international Criminal Court's investigation into atrocities committed in Ukraine, and the Justice Secretary has authorised additional financial support and the deployment of specialist investigators - we will not rest until justice is served.
