Biden: The world must prepare for a long battle

US President Joe Biden on Saturday described Ukraine's resistance against Russian forces as part of a "great fight for freedom", calling on the world to prepare for a long battle.

Biden said from the presidential palace in the Polish capital Warsaw that Russia "stifled democracy and sought to do so also in other places."

Addressing the Ukrainians, he added, "We are on your side. Point on the line."

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