Over the past week, US President Joe Biden has made a series of unscripted remarks that have upped the temperature of US-Russia relations to near boiling point.

However, his ad-libbed line at the end of what was billed as a "major speech" in Poland on Saturday - seemingly calling for President Vladimir Putin to be removed from power - may have landed the hardest.

In his speech to a crowd of assembled Polish government officials and dignitaries at the Royal Castle in Warsaw, the US president once again warned that the world was in the midst of an era-defining conflict between democracies and autocracies.

He pledged that Nato would defend "every inch" of its member states' soil. He also promised continued support to Ukraine, although he noted that the US military would not engage with Russian forces there.

It was a confrontational, but measured, speech - well in line with what US officials, from Secretary of State Antony Blinken on down, have been saying for months.

https://www.bbc.com/news/world-us-canada-60895392