Afghan withdrawal, Russia tensions placed on NATO agenda in 2021

For NATO, the world's longest-lasting military and political alliance, 2021 was the year when it withdrew from Afghanistan after two decades, and when its relations with Russia have been at the lowest point since the Cold War.

The inauguration of new US President Joe Biden, ending former President Donald Trump's term in January was seen as a positive development by the alliance, especially for the relationship between the US and its European allies.

Transatlantic relations were expected to warm up after Trump's desire to keep his distance from Europe's security and European countries’ desire to increase their defense spending.

So, right after Biden took office, he made statements about the US commitment to NATO and gave warm messages during meetings with the leaders of European countries.