The world this week -- Politics
After months of denying any such intention, Vladimir Putin, Russia's president, launched an invasion of Ukraine.
Russian troops appear to have entered the country not only from Russia itself, but also from Belarus and the Crimea, a Ukrainian territory seized by Russia in 2014.
Russian aircraft and missiles struck targets across the country, including near the capital, Kyiv.
Russian forces advanced on Kharkiv, the second city, and Mariupol, a strategic port.
Mr Putin said he was seeking to "de-Nazify" Ukraine.
The Ukrainian government declared martial law.
It claimed to be holding back Russian forces in several parts of the country.
Large traffic jams formed as civilians tried to flee Kyiv and other cities.
Airlines were warned not to fly over the country.
The scale of casualties was not immediately apparent.
Mr Putin's attack was immediately condemned by Western countries.
Joe Biden said that America would impose swift and severe sanctions on Russia.
Ursula von der Leyen, the president of the European Commission, promised the same on the EU's behalf.
It is time "to up the pain level", said Mark Warner, the chairman of the Senate Intelligence Committee.
NATO, the G7 and the EU all called emergency summits of their leaders.
Even before the invasion, Germany had suspended the process of starting up Nord Stream 2, an undersea pipeline intended to carry gas from Russia to Germany, deliberately bypassing Ukraine.
In response to the Russian invasion of Ukraine, Estonia invoked a clause of the NATO treaty for members under threat.
The alliance said it was deploying extra troops to eastern Europe to bolster its members' defences.
Mr Putin threatened "consequences that you have never faced in your history" for anyone attempting to interfere in the war.
The Israeli justice ministry found no evidence that the police bypassed judicial oversight and hacked the mobile phones of civilians.
Israel's attorney-general had ordered the investigation after a newspaper claimed the police spied on activists, businessmen and politicians.
A chemical explosion at a small-scale gold mine in Burkina Faso killed 59 people.
The number of artisanal and small gold mines in West Africa is growing rapidly, but few are regulated.
Six African countries -- Egypt, Kenya, Nigeria, Senegal, South Africa and Tunisia -- will receive the technology needed to produce mRNA vaccines in a project established by the World Health Organisation.
Britain's prime minister, Boris Johnson, announced an end to all domestic Covid-19 restrictions in England, including self-isolation for the infected (except for health staff). Some rules on travel remain in force.