Russia will target other European countries if it is not stopped, Ukrainian President Volodymyr Zelenskyy said Tuesday.

Speaking via videocall to a Joint Expeditionary Force summit held in London, Zelenskyy appealed for more support for his country’s struggle against Russia.

"We can still stop the Russian war machine, we can still stop the killing of people," he said.

Zelenskyy said stopping Russia would be "easier to do it together.”

"Because else (otherwise), they will come to you."

Zelenskyy warned that if European countries do not act now, Russia will target other countries on the continent.

"We all are the targets of Russia ... help yourself by helping us," he said.

British Prime Minister Boris Johnson, hosting the leaders of the JEF countries – a group including Denmark, Finland, Estonia, Iceland, Latvia, Lithuania, the Netherlands, Sweden and Norway, with several bordering Russia – agreed that we now face a "desperate, desperate moment,” adding that European leaders "must try to do more to support you."

Johnson is hosting the JEF leaders to discuss the almost three-week-old Russia-Ukraine war and further steps to assist Ukraine.

Johnson said prior to the meeting that “European security has been shaken by the attack of Russia on Ukraine, and alongside our partners, we will take action to ensure we emerge stronger and more united than before.”

“Ensuring we are resilient to Putin’s threats needs to go beyond our military footing – together alongside our North and Baltic Sea partners we must ensure we are insulated from Russia’s interference and impact on our energy supplies, economy and values.”

The JEF leaders are also “expected to agree to an enhanced program of integrated JEF exercises and activities at sea, on land and in the air in the High North, North Atlantic and Baltic Sea the member nations deepen military ties and interoperability.”

The Joint Expeditionary Force is a northern European security coalition of the UK, Denmark, Finland, Estonia, Iceland, Latvia, Lithuania, the Netherlands, Sweden and Norway.