Celebrations have taken place around the world, with light shows and fireworks as 2022 began.
People rallied across American cities on Saturday, with additional protests planned for later.
Chief international correspondent Lyse Doucet looks at the immediate impact of the US-Israeli strikes on Iran.
The BBC's Sarah Smith takes a look at Donald Trump's possible ambitions with this latest assault on Iran.
White House reporter Bernd Debusmann Jr is in Palm Beach, Florida, where President Donald Trump is once again directing US military action.
BBC presenter Clive Myrie reports from inside a bomb shelter in Tel Aviv, as Iran launched retaliatory strikes towards Israel.
The strikes were conducted by the US and Israel as part of Operation Epic Fury.
A video posted to social media shows scenes on the ground the aftermath of the strike on a neighborhood in Tehran.
US President Donald Trump accuses the Iranian regime of waging an "unending campaign of bloodshed and mass murder targeting the United States".
The BBC's Jon Donnison in Jerusalem reports as Trump says "major combat operations" have begun.
Millions of people around the world are celebrating the start of the Lunar New Year, with festivities taking place from Hong Kong to Buenos Aires.
The expiration of New START means there are no limits on nuclear weapons between both countries for the first time since 1991.
The BBC's Ione Wells looks at the Ecuadorian government's response to the incident, which occurred during a time of heightened tension in the US city.
The veterans remarks follow comments by US President Donald Trump suggesting Nato allies avoided front-line combat during the war in Afghanistan.
The BBC's Washington Correspondent Daniel Bush looks at the countries who have joined and how the charter's funding will be used.
It's the first time representatives from Kyiv, Moscow and Washington have come together since the full-scale invasion of Ukraine in 2022.
TikTok has finalised a deal to allow its American business to continue, by creating a new US entity separate from its global operations. The BBC's Asia Business Correspondent Suranjana Tewari breaks down what this could mean.
The US president held a charter-signing ceremony for his "new international oversight body", though several key allies were not present.
As Trump pushes for Greenland, Davos may not provide the friendly stage he's accustomed to.
Moroccan fans celebrated through the night as their beloved Atlas Lions beat Nigeria to make it to the Afcon final.
The BBC's Europe editor Katya Adler hears from Greenlanders, whose island is embroiled in a geopolitical storm.
