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 05, 2022, 7:20 AM EDT
Ukraine says 7 humanitarian corridors have opened to evacuate Mariupol residents
Seven humanitarian corridors from the besieged Ukrainian city of Mariupol were opened Tuesday to evacuate some of the 130,000 remaining residents, according to Ukrainian Deputy Prime Minister Iryna Vereshchuk.
Vereshchuk said in a statement via Telegram that the seven evacuation routes will allow Mariupol residents -- many of whom have been living without electricity, food, water or shelter -- to be transported to the city of Zaporizhzhia, about 140 miles northwest of Mariupol.
The facade of the Mariupol theater stands damaged folling shelling during Russia's invasion of Mariupol, Ukraine, April 4, 2022.
Alexei Alexandrov/AP
Mariupol Mayor Vadym Boychenko confirmed on Monday that a convoy of seven buses escorted by the International Committee of the Red Cross could not make it into his southeastern port city to evacuate trapped residents. However, more than 1,500 residents were still able to flee Mariupol using a single humanitarian corridor meant for private cars, according to the mayor.
Apr 05, 2022, 6:40 AM EDT
Russian brigade accused of Bucha atrocities will be sent back to war, Ukrainian intelligence says
A brigade of the Russian Ground Forces accused of committing war crimes in the Ukrainian city of Bucha will be sent back to war, according to the Main Directorate of Intelligence of the Ukrainian Ministry of Defense.
"The Russian command will not rotate the personnel in this unit and will throw it back to the front," the directorate said in a statement Tuesday.
As of Monday, Russia's 64th Motor Rifle Brigade was withdrawn from Ukraine to Belarus, according to Ukrainian intelligence. By Wednesday, the personnel will be transported to the western Russian city of Belgorod, just north of the border with Ukraine, with plans to return to the front line in the direction of the northeastern Ukrainian city of Kharkiv, according to Ukrainian intelligence.
"Usually, Russian units leaving the combat zone receive much more time for recovery and rest," the directorate said. "This indicates that 'special tasks' are expected for the 64th Brigade. The first of them: intimidation of inhabitants of settlements of Ukraine. Those who committed the crimes of genocide in Bucha may repeat this again in other cities."
Destroyed Russian military vehicles are seen on a street in Bucha, Ukraine, on April 4, 2022. The Ukrainian government has accused Russian forces of committing a "deliberate massacre" as they occupied and eventually retreated from Bucha, a town northwest of Kyiv. Dozens of bodies have been found in the days since Ukrainian forces regained control of the area.
Alexey Furman/Getty Images
"Another goal of the rapid return of the 64th Brigade to the territory of Ukraine is the rapid 'disposal' of unnecessary witnesses. That is, relocation to a part of the front where they will not have a chance to stay alive to make it impossible to testify in future courts," the directorate added. "The personnel of the unit, aware of the resonance of the events in Bucha and the responsibility for the crimes committed, massively opposes the return to Ukraine. However, the Russian command ignores these sentiments and threatens the tribunal if they refuse to continue fighting. The militaries do not accept reports of dismissal from Russian soldiers."
On Monday, the directorate published online what it said was a list with the names of hundreds of personnel of Russia's 64th Motor Rifle Brigade whom they believe were directly responsible for the atrocities in Bucha. Ukrainian officials have said there is evidence of other Russian units being involved. Russia has denied the claims.
-ABC News' Natalia Kushnir
Apr 05, 2022, 6:06 AM EDT
Ukraine has retaken 'key terrain' from Russia, UK says
Ukrainian troops have retaken "key terrain" in the north of the country, "after denying Russia the ability to secure its objectives and forcing Russian forces to retreat" from areas around Chernihiv and north of Kyiv, the U.K. Ministry of Defense said in an intelligence update Tuesday.
"Low-level fighting is likely to continue in some parts of the newly recaptured regions, but diminish significantly over this week as the remainder of Russian forces withdraw," the ministry added. "Many Russian units withdrawing from northern Ukraine are likely to require significant re-equipping and refurbishment before being available to redeploy for operations in eastern Ukraine."
Apr 05, 2022, 5:24 AM EDT
Peace talks may now be off the table, Zelenskyy says
Ukrainian President Volodymyr Zelenskyy indicated Tuesday that peace talks with Russia may now be off the table, following the gruesome discovery of scores of dead civilians in Bucha and other towns outside Ukraine's capital that were recently recaptured from Russian forces.
"The most difficult thing is to talk about what they did," Zelenskyy told reporters in Kyiv. "We believe that this is genocide. We believe that they should be punished for it."
"I believe that we need to set such a bar for these negotiations," he added. "It may happen that there will be no meeting."
Ukainian President Volodymyr Zelenskyy speaks to the press in the town of Bucha, Ukraine, April 4, 2022. Zelenskyy said on April 3, 2022 the Russian leadership was responsible for civilian killings in Bucha, outside Kyiv, where bodies were found lying in the street after the town was retaken by the Ukrainian army
Ronaldo Schemidt/AFP via Getty Images
Zelenskyy's comments came a day after he traveled to Bucha, northwest of Kyiv, where bodies in civilian clothes were found strewn in the streets and in mass graves. Many of the victims appeared to have been shot at close range and some even showed signs of torture. ABC News journalists on the ground saw some of the dead, including a family that locals said were executed with their hands bound.