US President Joe Biden is lifting restrictions on the use of American tactical missiles against Russia.

This is a major shift in US policy, previously Washington has only allowed the use of its weapons in Ukrainian territory.

It comes just weeks before the end of Biden’s term. President–elect Donald Trump has said he wants to end the war quickly.

President Vladimir Putin has repeatedly stated the use of American weapons on Russian soil would mean NATO was at war.

So, what are the reasons behind Biden's decision?

And could it turn the tide for Ukraine?