Czech Republic has said it will use some of the interest from seized Russian assets in the EU to pay for ammunition for Ukraine.
The country's defence minister Jana Cernochova said the move will let them buy "hundreds of thousands of much-needed large-calibre ammunition".
The Kremlin called the plan "theft" and said it would take legal action against anyone involved in the decision.
Ms Cernochova said: "The European Union decided on it. We can thus buy hundreds of thousands of much-needed large-calibre ammunition for Ukraine.
"It is another proof of the allies' trust in the Czech Republic and in our ammunition initiative.
"This is a unique opportunity to support Ukraine, to use resources originally belonging to Russia and to save the public finances of European countries."
