Boris Johnson urges west to ignore Putin threats and give Ukraine tanks

Former PM calls for heavy weapons supplies and brands Russian nuclear threats as nonsense' in Davos appearance

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Boris Johnson has urged the west not to fall for Russia's threat of nuclear war but instead increase its supply of heavy weaponry to Ukraine.

The former UK prime minister appeared on a breakfast panel at the World Economic Forum in Davos to discuss Ukraine - with Ukrainian president Volodymyr Zelenskiy joining via video link.