Ukrainians use the subway as a shelter 3:44
(CNN Spanish) --
Several Ukrainian cities are besieged, under Russian military aggression.
The attacks have killed dozens of people.
World leaders condemn the invasion, as European stocks plunge and oil tops $100. CNN's correspondent heard the explosions at the start of the invasion during a live broadcast.
Follow our special coverage minute by minute.
This is what you should know about the invasion of Ukraine
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Truth first
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"This could be the worst war since the turn of the century"
Leaders around the world have vehemently condemned Russian President Vladimir Putin's decision to order a special military operation in the Donbas region of Ukraine.
United Nations Secretary-General António Guterres urged Putin to return his troops to Russia and stop "what could be the worst war since the turn of the century."
NATO says the attack "puts countless civilian lives at risk."
The President of the European Council and the President of the European Commission issued a joint statement condemning "in the strongest possible terms" the Russian invasion of Ukraine.
What triggered the crisis between Russia and Ukraine?
2:54
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What does Putin want in Ukraine?
The conflict explained
The escalation in the years-long conflict between Russia and Ukraine has triggered Europe's biggest security crisis since the Cold War, raising the specter of a dangerous showdown between Western powers and Moscow.
What Putin has made clear is that he sees NATO's eastward expansion as an existential threat to Russia.
In addition, Putin has spoken about the history of the Soviet Union, saying that modern Ukraine "was created entirely by communist Russia."
How did we come to this conflict?
These four maps illustrate the factors on the ground in Ukraine-Russia tensions.
Ukraine's warning about Russia's entry into Kyiv 1:11
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Why would the Russian invasion of Ukraine shake the US and the world?
President Vladimir Putin's feared invasion of Ukraine will reverberate far beyond Russia and its democratic neighbor.
It will bring consequences that include painful spikes in gasoline prices, already high for Americans struggling to emerge from a once-in-a-century pandemic.
And it may reignite a Cold War that once seemed like a relic of history, creating a new and precarious standoff between the United States and Russia, the world's biggest nuclear powers.
The US president said Thursday that he "has no plans to speak" with Russian President Vladimir Putin, and that he authorized "the deployment of ground and air forces already stationed in Europe" in Estonia, Latvia, Lithuania, Poland and Romania.
Russian stocks plunge and ruble falls to record low 0:49
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Are we on the brink of a Third World War?
Following Russia's attack on Ukraine and the beginning of a massive invasion, President Volodymyr Zelensky announced martial law throughout the Ukrainian territory and called on his main allies to ask them to create an "anti-Putin coalition" stating that "the world must force Russia to peace".
Although the president of the United States, Joe Biden, has said that he will coordinate with NATO a “strong and united” response to the Kremlin offensive, he also stressed that there would only be a world war “if the Americans and the Russians start shooting at each other. each other."
CNN's José Levy addresses the issue.
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A specialist assures that NATO will not be able to intervene in Ukraine 0:40
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What is SWIFT and why could it be Russia's most feared weapon?
Some call it the "nuclear option."
As the Russian invasion of Ukraine progresses and governments around the world threaten and announce an unprecedented series of sanctions against the government of Vladimir Putin, there is one move in particular that seems to strike fear into the Kremlin: cutting the country off from the global banking system.
US lawmakers have suggested in recent weeks that Russia could be removed from SWIFT, a highly secure network that connects thousands of financial institutions around the world.
