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British Prime Minister Boris Johnson met the leaders of Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, the Netherlands, Norway and Sweden as part of the Joint Expeditionary Force on Tuesday.
The leaders reaffirmed their commitment to the restoration of peace and security in Europe after Russia’s "unprovoked and unjustified military aggression".
They called on Moscow to implement and uphold an immediate ceasefire to halt the humanitarian crisis and allow Ukraine’s civilian population access to food, water and medical aid.
The leaders agreed that Russia must respect international humanitarian law and that they supported the investigations of the International Criminal Court into alleged war crimes.
"The world will hold Russia to account for its actions. [Russian President Vladimir] Putin must fail," they said.
"JEF nations remain committed to supporting Ukraine at pace with military aid to ensure Ukraine is best able to defend itself."
The leaders said Mr Putin’s actions were fundamentally challenging the security of the Euro-Atlantic area.
They said his actions were unacceptable and that no other nations should fall victim to attempts of violent expansionism.
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Police officers detain a woman in central Moscow, during a protest against Russian military action in Ukraine. AFP -
Children look at phones as people who fled the conflict in Ukraine wait outside an immigration office in Brussels, Belgium. Reuters -
Soldiers stand next to a bus with a damaged windscreen, after an attack on the Yavoriv military base, in Novoyavorivsk, Ukraine. Reuters -
A soldier waits at a hospital after the attack on the Yavoriv military base. Reuters -
A wounded soldier is transported by medical workers, at a hospital in Novoyavorivsk, after the attack on the Yavoriv military base. Reuters -
Rescuers work at the site of an accident after a bus that was carrying about 50 Ukrainian refugees overturned near Forli, central Italy. One person died in the crash. AFP -
A man wounded in the air strikes at a nearby military complex is assisted by medical staff outside Novoiavorivsk District Hospital. Getty Images -
Paramedics find low ground after an air-raid siren sounds on the outskirts of Novoiavorivsk. Getty Images -
A view of a residential building damaged during an air strike, as Russia's invasion of Ukraine continues, in Chernihiv, Ukraine. Reuters -
A tram damaged by shelling sits at a depot, in Kharkiv. AP -
An abandoned doll next to a car riddled with bullets in Irpin, north of Kyiv. AFP -
A Ukrainian soldier holds a Next Generation Light Anti-tank Weapon that was used to destroy a Russian armoured personal carrier in Irpin. AFP -
Residents try to strengthen the wall of a house damaged by recent shelling, on the outskirts Kyiv. AFP -
Firefighters extinguish a blaze at a house after shelling in Kyiv. AFP -
A convoy of pro-Russian troops outside the separatist-controlled town of Volnovakha in the Donetsk region, Ukraine. Reuters -
Smoke from shelling rises behind a wreath at a cemetery in Vasylkiv, south-west of Kyiv. AP -
A woman stands outside a local hospital, damaged during fighting in Volnovakha. Reuters -
People gather in the basement of a local hospital, which was damaged during clashes in Volnovakha. Reuters -
A Ukrainian soldier leaves a damaged building after shelling in Kyiv. AFP -
Ukrainian President Volodymyr Zelensky. AFP -
A finance police officer boards Russian billionaire Andrey Igorevich Melnichenko's superyacht, which has been sequestered at the northern port of Trieste, Italy. Reuters -
A Russian KA-52 gunship strikes a Ukrainian military object. AFP -
Bystanders watch what appears to be Russian forces arresting Ivan Fedorov, mayor of Melitopol, a city in south-eastern Ukraine. Reuters -
Firefighters battle a blaze at a warehouse storing frozen products hit by shelling in Kvitneve, Kyiv region. Reuters -
A soldier loads the cargo hold of a chartered Boeing 747 airplane with duffle bags belonging to US soldiers, during their deployment to Europe, at Hunter Army Airfield in Savannah, Georgia. AP -
Two young girls pray for peace in Ukraine at Lisbon's 16th century Jeronimos Monastery. AP Photo -
A volunteer of the Ukrainian Territorial Defence Forces walks on the debris of a car wash destroyed by Russian bombing in Baryshivka, east of Kyiv. AP Photo -
Volunteers pass an improvised path under a destroyed bridge as they help an elderly resident in Irpin, north-west Kyiv. AP Photo -
A woman who was evacuated from Irpin kisses a cat wrapped in a blanket at a triage point in Kyiv. AP Photo -
An explosion is seen in an apartment building after a Russian army tank fires in Mariupol. AP Photo -
A Russian army tank moves through a street on the outskirts of Mariupol. AP Photo -
Tonya Steyn, office manager and volunteer co-ordinator, sorts through medical supplies at the non-governmental organisation, SOS International headquarters in Louisville, Kentucky. AFP -
An overview of damaged buildings and burning fuel storage tanks at Antonov Airport in Hostomel, north-west of Kyiv. Maxar Technologies / AFP -
The destroyed main building of school number 25, after being bombed in Zhytomyr. EPA -
A supporter holds a sign to support Ukraine during Paris' mayor and 'Socialist party' (PS) presidential candidate's campaign meeting in Rennes, western France. AFP
Later on Tuesday, Mr Johnson held private talks with Swedish Prime Minister Magdalena Andersson and agreed that the “abhorrent assault” on Ukraine had “shifted European thinking”, Downing Street said.
“The pair agreed that their two nations should further strengthen their work together on disinformation and said they looked forward to British and Swedish forces exercising together as part of JEF in the coming months," a Downing Street spokeswoman said.
“Both agreed on the need to reduce dependency on Russian hydrocarbons and the prime minister said renewables were a key part of the UK’s energy security strategy.”
Mr Johnson and Ms Andersson agreed that the UK and Sweden “would continue to work closely to increase defence ties, combat climate change and ensure Putin fails”.
Finnish President Sauli Niinisto also met Mr Johnson and No 10 said the two leaders agreed that Mr Putin's “invasion had dramatically changed the landscape of European security”.
“The prime minister reiterated that sovereign countries should be able to choose their own future, without fear or threat from Russia,” the spokeswoman said.
