Zelenskyy calls for ‘strong decisions’ at Nato summit as Russia kills 21 in overnight strikes on Kyiv – as it happened

Ukraine's president makes plea ahead of summit this week in Ankara where he is due to meet Trump on the sidelines

Meanwhile, the UK has just sanctioned Russian actors involved in researching, developing and producing the novichok nerve agent and the lethal toxic Epibatidine, used in the Salisbury attack and the poisoning of Alexei Navalny.

Among those sanctions are SC Signal, a Russian state scientific research institute, as well as three individuals researching novichok and Epibatidine.

Russia's repeated use of chemical weapons is a sickening violation of international law and a direct threat to global security.

From the use of novichok nerve agents in Salisbury to Epibatidine in Siberia, poisoning Dawn Sturgess and Alexei Navalny, Russia continues to use barbaric tools to inflict death and suffering on innocent civilians, including in Ukraine.