Russian President Vladimir Putin's "special military operation” into Ukraine began on Feb. 24, with troops crossing the border from Belarus and Russia. Moscow's forces have since been met with “stiff resistance” from Ukrainians, according to U.S. officials.
Russian forces retreated last week from the Kyiv suburbs, leaving behind a trail of destruction. After graphic images emerged of civilians lying dead in the streets of Bucha, U.S. and European officials accused Russian troops of committing war crimes.
A look at the two leaders at the center of the war in Ukraine and how they both rose to power, the difference in their leadership and what led to this moment in history.
Here's how the news is developing. All times Eastern.
Apr 03, 2022, 10:37 PM EDT
Zelenskyy speaks at Grammys: 'Our musicians wear body armor instead of tuxedos'
Ukrainian President Volodymyr Zelenskyy made a brief speech at the 2022 Grammy Awards on Sunday night.
Zelenskyy, in a video message, said war is the opposite of music, but hopes soon the silence of death will be filled with the sound of music.
LAS VEGAS, NEVADA - APRIL 03: President of Ukraine Volodymyr Zelenskyy speaks on screen prior to John Legend performing onstage during the 64th Annual GRAMMY Awards at MGM Grand Garden Arena on April 03, 2022 in Las Vegas, Nevada.
Rich Fury/Getty Images for The Recording A
"The war doesn't let us choose who survives and who stays in eternal silence. Our musicians wear body armor instead of tuxedos," Zelenskyy told the audience. "They sing to the wounded. In hospitals. Even to those who can't hear them. But the music will break through anyway."
Apr 03, 2022, 8:14 PM EDT
7 dead, 34 wounded in Kharkiv shelling, 70% of Chernihiv destroyed
At least seven civilians are dead and 34 are wounded following shelling in Kharkiv, the region's prosecutor's office announced Sunday.
The shelling occurred Sunday evening in the city's Slobidskyi district, according to the Kharkiv regional military administration Oleg Sinehubov, who added that children are among the victims.
Meanwhile, in Chernihiv, around 70% of the city has been destroyed, according to Mayor Vladyslav Atroshenko, who was speaking on Ukrainian TV.
He added that businesses are not operating. Ukrainian soldiers have been able to liberate several villages in the Chernihiv region in the past couple of days.
-ABC News' Christine Theodorou
Apr 03, 2022, 4:20 PM EDT
'Concentrated evil has come,' Zelenskyy addresses civilian deaths in Bucha
Following graphic images of casualties coming out of Bucha, Ukraine, after Russian military withdrawal, Ukrainian President President Volodymyr Zelenskyy has strong words about what he called, "concentrated evil," in his daily address Sunday. Here are excerpts from that address:
"Hundreds of people were killed. Tortured, executed civilians. Corpses on the streets. Mined area. Even the bodies of the dead were mined!"
"Concentrated evil has come to our land. Murderers. Torturers. Rapists. Looters. Who call themselves the army. And who deserve only death after what they did."
Bodies lie in the street in Bucha, northwest of Kyiv, in Ukraine on April 2, 2022 after Russian forces withdrew from the town.
Ronaldo Schemidt/AFP via Getty Images
"I want every mother of every Russian soldier to see the bodies of the killed people in Bucha, in Irpin, in Hostomel. What did they do? Why were they killed? What did the man who was riding his bicycle down the street do? Why were ordinary civilians in an ordinary peaceful city tortured to death? Why were women strangled after their earrings were ripped out of their ears? How could women be raped and killed in front of children? How could their corpses be desecrated even after death? Why did they crush the bodies of people with tanks? What did the Ukrainian city of Bucha do to your Russia? How did all this become possible?"
"All partners of Ukraine will be informed in detail about what happened in the temporarily occupied territory of our state. War crimes in Bucha and other cities during the Russian occupation will also be considered by the UN Security Council on Tuesday."
A dog reacts as communal service workers collect a body of a man, possible it's owner, killed by Russian troops shelling in town of Bucha, not far from the Ukrainian capital of Kyiv, April 3, 2022.
Sergei Supinsky/AFP via Getty Images
Zelenslyy also invited former German Chancellor Angela Merkel and former French President Nicolas Sarkozy to Ukraine to witness the carnage.
"We do not blame the West. We do not blame anyone but the specific Russian military who did this against our people," Zelenskyy, who has pleaded with the U.S. and NATO allies to create a no-fly zone over Ukraine, a measure so far, that President Joe Biden and other Western leaders have refused to do, said.
-ABC News' Christine Theodorou
Apr 03, 2022, 3:02 PM EDT
World leaders react to images showing bodies of civilians scattered on streets
Several world leaders on Sunday reacted to images shared by Ukraine's president's office, claiming to show the bodies of civilians scattered on the streets after the withdrawal of Russian troops from areas northwest of Kyiv.
In some of the photos, unarmed civilians appear to have been executed with their hands tied behind their backs.
NATO Secretary-General Jens Stoltenberg called the deaths of civilians in Bucha a “brutality" on CNN's "State of the Union" show, and said “I strongly welcome” an investigation by International Criminal Court, which has opened an investigation into war crimes in Ukraine.
People react as they gather close to a mass grave in town of Bucha, just northwest of the Ukrainian capital Kyiv, April 3, 2022.
Sergei Supinsky/AFP via Getty Images
"You can't but [see] those images as a punch to the gut ... Since the aggression, we've come out and said that we believe Russian forces have committed war crimes and we've been working to document that, to provide the information that we have to the relevant institutions and organizations that will put all of this together," U.S. Secretary of State Anthony Blinken told CNN's State of the Union Sunday.
"Russia’s despicable attacks against innocent civilians in Irpin and Bucha are yet more evidence that Putin and his army are committing war crimes in Ukraine," U.K. Prime Minister Boris Johnson said. "No denial or disinformation from the Kremlin can hide what we all know to be the truth -- Putin is desperate, his invasion is failing, and Ukraine’s resolve has never been stronger. I will do everything in my power to starve Putin’s war machine. We are stepping up our sanctions and military support, as well as bolstering our humanitarian support package to help those in need on the ground. The UK has been at the forefront of supporting the international Criminal Court's investigation into atrocities committed in Ukraine. The Justice Secretary has authorized additional financial support and the deployment of specialist investigators – we will not rest until justice is served," Johnson said.
Other world leaders expressed their feelings on social media.
"Appalled by reports of unspeakable horrors in areas from which Russia is withdrawing. An independent investigation is urgently needed. Perpetrators of war crimes will be held accountable," European Commission President Ursula von der Leyen posted on Twitter.
"Mass killings of Ukrainian civilians by #Russia are clear war crimes," Estonia's Prime Minister Kaja Kallas said on Twitter.. "We need courage, moral clarity and more action to stop it. Indifference is the mother of all crimes. Evidence must be gathered, saved for trials, and perpetrators must face justice. We need a 5th round of strong EU sanctions as soon as possible. Finally, our top priority should be increased military aid to #Ukraine. They need it to take back their cities and free people from Russian occupation and repression. #StandWithUkraine"
The prime minister of Slovenia, Janez Janša also weighed in on Twitter: "This are massive crimes against humanity. Russian army behaves as a horde of KGB executioners at Katyn. And at many other places after and before. Never bearing responsibility. After seeing #BuchaMassacre, we are terrified to even imagine what we will see in #Mariupol."
People react as they gather close to a mass grave in town of Bucha, just northwest of the Ukrainian capital Kyiv on April 3, 2022.
Sergei Supinsky/AFP via Getty Images
Belgium's Foreign Minister Sophie Wilmès, also posted om Twitter: "The images from the city of #Bucha confirm the fears we have had since February, which have led us to support several international investigations, including that of the @IntlCrimCourt. Impunity must not be allowed."
"Terrible images of destruction and reported executions of civilians in Bucha, Ukraine, in wake of Russian aggression. Reminiscent of darkest scenes from European history. To fight impunity :flag-se: will support @IntlCrimCourt investigation, incl financially and with seconded personnel," Sweden's prime minister, Magdalena Andersson, also posted to Twitter
