For months, President Vladimir Putin denied he would invade his neighbour, but then he tore up a peace deal, sending forces across borders in Ukraine’s north, east and south.
As the number of dead climbs, he stands accused of shattering peace in Europe. What happens next could jeopardise the continent’s entire security structure.
Why have Russian troops attacked?
Russian troops are closing in on Ukraine’s capital, days after Russia’s leader ordered a full-scale invasion from the north, east and south. In a pre-dawn TV address on 24 February, he declared Russia could not feel “safe, develop and exist” because of what he claimed was a constant threat from modern Ukraine.
Airports and military headquarters were hit first then tanks and troops rolled into Ukraine from Russia, Russian-annexed Crimea and ally Belarus.
Many of President Putin’s arguments were false or irrational. He claimed his goal was to protect people subjected to bullying and genocide and aim for the “demilitarisation and de-Nazification” of Ukraine. There has been no genocide in Ukraine: it is a vibrant democracy, led by a president who is Jewish.
“How could I be a Nazi?” said Volodymr Zelensky, who likened Russia’s onslaught to Nazi Germany’s invasion in World War Two. Ukraine’s chief rabbi and the Auschwitz Memorial have also rejected Mr Putin’s slur.
President Putin has frequently accused Ukraine of being taken over by extremists, ever since its pro-Russian president, Viktor Yanukovych, was ousted in 2014 after months of protests against his rule.
Russia then retaliated by seizing the southern region of Crimea and triggering a rebellion in the east, backing separatists who have fought Ukrainian forces in a war that has claimed 14,000 lives.
Late in 2021, Russia began deploying big numbers of troops close to Ukraine’s borders, while repeatedly denying it was going to attack. Then Mr Putin scrapped a 2015 peace deal for the east and recognised areas under rebel control as independent.
Russia has long resisted Ukraine’s move towards the European Union and the West’s defensive military alliance, Nato. Announcing Russia’s invasion, he accused Nato of threatening “our historic future as a nation”.
How far will Russia go?
It is now clear that Russia is seeking to overthrow Ukraine’s democratically elected government. Its aim is that Ukraine be freed from oppression and “cleansed of the Nazis”.
President Zelensky said he had been warned “the enemy has designated me as target number one; my family is target number two”.
This false narrative of a Ukraine seized by fascists in 2014 has been spun regularly on Kremlin-controlled TV. Mr Putin has spoken of bringing to court “those who committed numerous bloody crimes against civilians”.
What Russia’s plans are for Ukraine are unknown, but it faces stiff resistance from a deeply hostile population.
In January, the UK accused Moscow of plotting to install a pro-Moscow puppet to lead Ukraine’s government – a claim rejected at the time by Russia as nonsense. One unconfirmed intelligence report has suggested Russia aims to split the country in two.
In the days before the invasion, when up to 200,000 troops were near Ukraine’s borders, Russia’s public focus was purely on the eastern areas of Luhansk and Donetsk.
By recognising the separatist areas controlled by Russian proxies as independent, Mr Putin was telling the world they were no longer part of Ukraine. Then he revealed that he supported their claims to far more Ukrainian territory.
The self-styled people’s republics cover little more than a third of the whole of Ukraine’s Luhansk and Donetsk regions, but the rebels covet the rest, too.
How dangerous is this invasion for Europe?
These are terrifying times for the people of Ukraine and horrifying for the rest of the continent, witnessing a major power invading a European neighbour for the first time since World War Two.
Hundreds have died already in what Germany has dubbed “Putin’s war”, both civilians and soldiers. And for Europe’s leaders, this invasion has brought some of the darkest hours since the 1940s.
France’s Emmanuel Macron has spoken of a turning point in Europe’s history while Germany’s Olaf Scholz has warned that “Putin wants a Russian empire”. Recalling the Cold War days of the Soviet Union, Volodymyr Zelensky spoke of Ukraine’s bid to avoid a new iron curtain closing Russia off from the civilised world.
Russia’s leader has even put his nuclear forces on high alert.
For the families of both armed forces, there will be anxious days ahead. Ukrainians have already suffered a gruelling eight-year war with Russian proxies. The military has called up all reservists aged 18 to 60 years old.
This is not a war that Russia’s population was prepared for, either, as the invasion was rubber-stamped by a largely unrepresentative upper house of parliament.
The invasion has knock-on effects for many other countries bordering both Russia and Ukraine. Poland, Hungary, Romania, Moldova and Slovakia are seeing a big influx of refugees, while the EU suggests more than seven million people could be displaced.
Nato has deployed several thousand troops in the Baltic states and Poland and for the first time is activating part of its much larger rapid reaction force. Nato will not say where but some could go to Romania, Bulgaria, Hungary and Slovakia.
At the same time, the West is targeting Russia’s economy, financial institutions and individuals:
The EU, US, UK, Japan and Canada are cutting off key Russian banks from the international Swift payment network, which allows the smooth and rapid transfer of money across borders
The EU, UK and Canada have shut off their airspace to Russian airlines
Personal sanctions are being imposed on President Putin and Foreign Minister Sergei Lavrov by the US, EU and UK, while 351 Russian MPs are being targeted by the EU
Russia’s state-run media Sputnik and Russia Today, seen as a Kremlin mouthpiece, are being banned across the EU
The Russian city of St Petersburg will no longer be able to host this year’s Champions League final and the Russian Grand Prix will not take place in Sochi.
What does Putin want?
He has not only demanded that Ukraine never join Nato but that the alliance turns the clock back to 1997 and reverses its eastward expansion. He has complained Russia has “nowhere further to retreat to – do they think we’ll just sit idly by?”.
He wants Nato to remove its forces and military infrastructure from member states that joined the alliance from 1997 and not to deploy “strike weapons near Russia’s borders”. That means Central Europe, Eastern Europe and the Baltics.
He has claimed modern Ukraine was entirely created by communist Russia and is now a puppet state, controlled by the West. It was his pressure on Ukraine not to sign an association treaty with the EU in 2013 that sparked the protests that ousted its pro-Kremlin president.
In President Putin’s eyes, the West promised back in 1990 that Nato would expand “not an inch to the east”, but did so anyway.
That was before the collapse of the Soviet Union, however, so the promise made to then Soviet President Mikhail Gorbachev only referred to East Germany in the context of a reunified Germany. Mr Gorbachev said later “the topic of Nato expansion was never discussed” at the time.
What has Nato said?
Nato is a defensive alliance with an open-door policy to new members, and its 30 member states are adamant that will not change.
Ukraine’s president wants a clear timeline, but there is no prospect of Ukraine joining for a long time, as Germany’s chancellor has made clear.
The idea that any current Nato country would give up its membership is a non-starter.
Is there a diplomatic way out?
There seems very little chance for the moment, even if some form of talks is planned.
Russia insists Kyiv lays down its arms and demilitarises, and that will not happen.
Beyond the war, any eventual deal would have to cover the status of eastern Ukraine as wells as arms control with the West.
The US had offered to start talks on limiting short- and medium-range missiles, as well as on a new treaty on intercontinental missiles. Russia wanted all US nuclear arms barred from beyond their national territories.
Russia had been positive towards a proposed “transparency mechanism” of mutual checks on missile bases – two in Russia, and two in Romania and Poland.