It has been reported more than 137 civilians and military personnel have been killed in Ukraine so far.
Vladimir Putin launched a Russian attack on the neighbouring country in an attempt to take over with his own regime.
The Russian President described the invasion as a 'specialised military operation' in an announcement on Thursday morning.
READ MORE: Russia Ukraine war LIVE updates as rockets strike Kyiv and more than 100 dead
The first day of invasion saw more than 200 attacks take place, with warnings Russian forces could close in on the capital of Kyiv.
The Ukrainian foreign minister, Dmytro Kuleba, said just before 4am on Friday that "horrific rocket strikes" hit Kyiv in an attack he compared to the city's 1941 shelling by Nazi Germany.
He said: "Last time our capital experienced anything like this was in 1941 when it was attacked by Nazi Germany.
"Ukraine defeated that evil and will defeat this one. Stop Putin. Isolate Russia. Sever all ties. Kick Russia out of (everywhere)."
What happened, where is under attack and what could be next?
Russian forces launched a full-scale invasion in the early hours of Thursday, thought to be Moscow's most aggressive action since the Soviet invasion of Afghanistan in 1979.
By the end of the day, the Ukrainian government said 137 civilians and military personnel had been killed.
Shelling has been reported in cities and areas across Ukraine including Kyiv, Kharkiv, Lviv, Chuhuiv, Odessa, Donetsk and Brovary.
Leaders of the 30 Nato allied nations will meet on Friday, US President Joe Biden confirmed, as they come under pressure to go even further than sanctions already announced to hit the Kremlin after what Boris Johnson described as a "dark day in the history of our continent".
What is Ukraine doing?
Ukrainian President Volodymyr Zelensky has ordered a full military mobilisation.
In a decree issued late on Thursday, he said the the mobilisation would last 90 days.
Ukraine’s state border guard service has banned Ukrainian men between the ages of 18 and 60 from leaving the country.
As bombs hit Ukraine's cities, air sirens sounded and people fled to makeshift bomb shelters.
The Kyiv government created a Google Maps list of bomb shelters people can search to see where their nearest is.
In Kyiv and Kharkiv, many sought shelter in Metro stations, bringing suitcases with any belongings they could fit in, as well as children and dogs.
What is the UK doing about it?
Mr Johnson yesterday announced the "largest and most severe" package of sanctions Russia has ever faced to punish Mr Putin.
Among the new UK sanctions introduced were measures to hit five further oligarchs, including the Russian president's former son-in-law, and to target more than 100 businesses and individuals.
He said he intends to hit "all the major manufacturers that support Putin's war machine."
The sanctions will also ban Aeroflot from touching down planes in the UK and will freeze the assets of all major Russian banks, including immediately against VTB.
Is Russia winning the war?
The UK's Ministry of Defence (MoD) said it is "unlikely" Russia achieved its planned objectives for the first day of its military action in Ukraine, crediting "fierce resistance" from the Ukrainian forces.
The MoD said in a statement just after 1am today: "The Ukrainian Armed Forces have reportedly halted Russia's advance towards Chernihiv. Fighting probably continues on the outskirts of the city.
"It is unlikely that Russia has achieved its planned Day 1 military objectives. Ukrainian forces have presented fierce resistance across all axes of Russia's advance."
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