The Ukrainian military said Russia's attack involved almost 600 drones and more than 30 ballistic and cruise missiles, marking its first combined attack on the Ukrainian capital in weeks.
Alongside the 17 killed and damage to the British Council building, dozens more were injured and a five-storey residential building was destroyed.
The EU will also summon its Russian envoy over Moscow's strikes on Kyiv following the air strike on its office. No one was hurt in this attack.
The bloc's foreign policy chief Kaja Kallas has said the attack showed Russia had made a"deliberate choice to escalate and mock the peace efforts".
Prime Minister Sir Keir Starmer has accused Russia of"sabotaging hopes of peace" with its "senseless" attacks.