Europe will respond to any tariffs imposed by President Donald Trump in a proportionate way, the European Union's commissioner for the economy told CNBC Wednesday.

Speaking to Europe’s elites at the World Economic Forum in Davos, Zelensky laid into many of the European countries that have helped keep Ukraine afloat since the Russian invasion, chiding them for not taking their own defense and the threat from Moscow sufficiently seriously.

Speaking a day after Trump’s inauguration, Ukraine’s president told world leaders at Davos that Europe needs to remain united and “learn how to take care of itself.”

Volodymyr Zelensky has warned European leaders Donald Trump will ignore them if the continent doesn’t take better care of its own defences.