Any country trying to intervene in the Ukraine war will face a “lightning-fast” response, Russian President Vladimir Putin has warned.

“We have all the tools no-one can boast of… we will use them if necessary,” he said, in what is seen as a reference to ballistic missiles and nuclear arms.

Ukraine’s allies have stepped up the supply of weapons, with the US vowing to make sure Ukraine defeats Russia.

Western officials say Russia is being hampered in its efforts in the east.

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