The leaders of states and governments of NATO member states called on Russia to immediately cease fire and sit down at the negotiating table.

"Russia needs to show it is serious about negotiations by immediately implementing a ceasefire. We call on Russia to engage constructively in credible negotiations with Ukraine to achieve concrete results, starting with a sustainable ceasefire and moving towards a complete withdrawal of its troops from Ukrainian territory," according to a statement adopted following the extraordinary summit of the alliance, which was held on Thursday in Brussels.

The leaders also said Russia's continued aggression during the discussion was "regrettable." "We support Ukraine's efforts to achieve peace, and those undertaken diplomatically by Allies to weigh in on Russia to end the war and relieve human suffering. We stand in full solidarity with President Zelensky, the government of Ukraine, and with the brave Ukrainian citizens who are defending their homeland," the statement reads.

"We honour all those killed, injured, and displaced by Russia's aggression, as well as their families. We reaffirm our unwavering support for the independence, sovereignty, and territorial integrity of Ukraine within its internationally recognized borders extending to its territorial waters," the statement reads.

"Ukraine has a fundamental right to self-defence under the United Nations Charter. Since 2014, we have provided extensive support to Ukraine's ability to exercise that right. We have trained Ukraine's armed forces, strengthening their military capabilities and capacities and enhancing their resilience. NATO Allies have stepped up their support and will continue to provide further political and practical support to Ukraine as it continues to defend itself," the allies said.

"NATO Allies will also continue to provide assistance in such areas as cybersecurity and protection against threats of a chemical, biological, radiological, and nuclear nature. NATO Allies also provide extensive humanitarian support and are hosting millions of refugees. Foreign Ministers will discuss further our support to Ukraine when they meet in April," the leaders said.