Russia-Ukraine war: Key events in 2nd year of Russia's invasion of Ukraine

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Russian President Vladimir Putin announced on Feb. 21, 2022, that he had recognized two Russian-backed separatist areas in eastern Ukraine, Donetsk and Luhansk, as independent states.

Ukrainian President Volodymyr Zelenskyy followed the announcement by saying that Ukraine had cut diplomatic ties with Russia. Putin then gave a speech on Feb. 24, 2022, announcing he would launch a "special military operation" in Ukraine.

Minutes after the announcement, explosions could be heard in Kyiv. What followed was a full-scale invasion of Ukraine, with thousands of troops crossing the country's borders.

Two years later, the war is still ongoing. Here are a few key events from the last 12 months.

Wall Street Journalist is detained in Russia

Wall Street Journal reporter Evan Gershkovich was arrested and detained by Russian authorities in March on espionage charges, allegations that Gershkovich, the WSJ, the U.S. government and dozens of international news organizations have vehemently denied.

PHOTO: Wall Street Journal reporter Evan Gershkovich appears during a court hearing to consider an appeal against his detention, in Moscow, Russia, June 22, 2023. (Evgenia Novozhenina/Reuters)
PHOTO: Wall Street Journal reporter Evan Gershkovich appears during a court hearing to consider an appeal against his detention, in Moscow, Russia, June 22, 2023. (Evgenia Novozhenina/Reuters)

He's since appealed his pretrial detention, appearing several timesin Moscow courtrooms.

Alsu Kurmasheva, a journalist with Europe/Radio Liberty, was also detained in October and charged with failure to register as a foreign agent, according to the news outlet on Wednesday. Kurmasheva, who serves as an editor for the outlet's Tatar-Bashkir Service, is a dual U.S.-Russian citizen, RFE/RL said.

Both Geshkovich and Kurmasheva remain in pre-trial detention in Russia.

"Next month will mark one year since Evan’s arrest and wrongful detention -- a milestone that was once unthinkable for his family, friends and his colleagues," Almar Latour, CEO of Dow Jones and publisher of The Wall Street Journal, and Emma Tucker, Wall Street Journal Editor in Chief, said in a statement this month.

They added, "As we have said since day one and will for as long as it takes -- we continue to demand his immediate release and will not rest until he is home."

Ukraine begins long-awaited counteroffensive

After weeks of anticipation, Ukraine began its long-awaited counteroffensive against Russia in mid-June, local officials told ABC News.

PHOTO: A Ukrainian soldier observes his surrounding from a shelter on the frontline in the Zaporizhzhia region, Ukraine, July 2, 2023. (Libkos/AP)
PHOTO: A Ukrainian soldier observes his surrounding from a shelter on the frontline in the Zaporizhzhia region, Ukraine, July 2, 2023. (Libkos/AP)

Western officials said at the time that Russia’s forces in Ukraine were so badly depleted that Russia may lack the reserves to effectively respond to a major counteroffensive from Ukrainian troops.

Russian paramilitary leader Yevgeny Prigozhin led a 1-day rebellion

A chaotic armed rebellion that threatened the longstanding leadership of Putin began on a Friday in late June 2023. It was quelled by Saturday evening.

PHOTO: In this handout photo taken from video released by Prigozhin Press Service, Yevgeny Prigozhin, the owner of the Wagner Group military company, records his video addresses in Rostov-on-Don, Russia, Saturday, June 24, 2023. (AP)
PHOTO: In this handout photo taken from video released by Prigozhin Press Service, Yevgeny Prigozhin, the owner of the Wagner Group military company, records his video addresses in Rostov-on-Don, Russia, Saturday, June 24, 2023. (AP)

MORE: Russian rebellion timeline: How the Wagner uprising against Putin unfolded and where Prigozhin is now

The uprising, led by Yevgeny Prigozhin, chief of the paramilitary Wagner Group, began in the southern Russian city of Rostov-on-Don. Forces loyal to Prigozhin marched toward Moscow, before turning back Saturday night.

PHOTO: Russian Rebellion Timeline (ABC News)
PHOTO: Russian Rebellion Timeline (ABC News)

Prigozhin was on the passenger list of a plane that crashed in August in Russia's Tver region, killing all on board.

MORE: STORY Yevgeny Prigozhin, Wagner Group leader killed in plane crash, buried in private funeral

Counteroffensive progress was slow, but not a 'stalemate,' a US official said

White House national security adviser Jake Sullivan said Sunday that the war in Ukraine hasn't devolved into a stalemate but he acknowledged it remains "hard going" against Russia.

PHOTO: White House national security adviser Jake Sullivan speaks during a press briefing at the White House, on July 7, 2023, in Washington, D.C. (Patrick Semansky/AP)
PHOTO: White House national security adviser Jake Sullivan speaks during a press briefing at the White House, on July 7, 2023, in Washington, D.C. (Patrick Semansky/AP)

"We said before this counteroffensive started that it'd be hard going, and it's been hard going," Sullivan said in an interview with ABC News "This Week" anchor George Stephanopoulos, referring to a new push by the Ukrainians that began this summer. "That's the nature of war, but the Ukrainians are continuing to move forward."

MORE: Ukraine-Russia war hasn't become stalemate but counteroffensive is 'hard going': Sullivan

Zelenskyy tells ABC News the counteroffensive may force Putin into a dialogue

In a sit-down in July with ABC News' Chief Global Affairs Correspondent Martha Raddatz that aired on "This Week," President Volodymyr Zelenskyy described the current situation.

PHOTO: Ukrainian President Volodymyr Zelenskyy speaks with ABC News' Martha Raddatz. (Yuriy Boyko/ABC News)
PHOTO: Ukrainian President Volodymyr Zelenskyy speaks with ABC News' Martha Raddatz. (Yuriy Boyko/ABC News)

"Well, it is absolutely clear, logical rhetoric that at that moment when Ukraine will reach the administrative border with a temporarily occupied Ukrainian peninsula, Crimea, it's very likely that Putin will be forced to seek dialogue with the civilized world, unlike how it was before the full-scale invasion, because he will be weakened," Zelenskyy said.

MORE: Zelenskyy to ABC: How Russia-Ukraine war could end, thoughts on US politics and Putin's weakness

Ukraine took heavy casualties in its counteroffensive

There is mounting evidence that Ukraine has been taking heavy casualties in its counteroffensive, which began roughly ten weeks ago.

PHOTO: Ukrainian soldiers fire a mortar towards Russian positions at the front line, near Bakhmut, Donetsk region, Ukraine, on Aug. 12 2023. (Libkos/AP)
PHOTO: Ukrainian soldiers fire a mortar towards Russian positions at the front line, near Bakhmut, Donetsk region, Ukraine, on Aug. 12 2023. (Libkos/AP)

ABC News spoke with two former U.S. soldiers who are contracted in a special forces division of the Ukrainian military and who were both injured during an operation in eastern Ukraine two weeks ago.

Both soldiers are currently in a hospital in Kyiv but said they hope to be transferred to Germany for surgery this week in order to remove shrapnel from their bodies.

MORE: Ukraine taking heavy casualties 10 weeks into its counteroffensive

At the 2-year mark

The U.S. Congress remains deadlocked on further military aid, as Ukrainian officials have for months raised alarms about the military's dwindling stockpile.

PHOTO: Ukrainian anti-aircraft gunners of the 93rd Separate Mechanized Brigade Kholodny Yar monitor the sky from their positions in the direction of Bakhmut in the Donetsk region, amid the Russian invasion of Ukraine, on Feb. 20, 2024.  (Anatolii Stepanov/AFP via Getty Images)
PHOTO: Ukrainian anti-aircraft gunners of the 93rd Separate Mechanized Brigade Kholodny Yar monitor the sky from their positions in the direction of Bakhmut in the Donetsk region, amid the Russian invasion of Ukraine, on Feb. 20, 2024. (Anatolii Stepanov/AFP via Getty Images)

The U.S. has supplied at least $44.9 billion to Kyiv, but if Congress doesn't pass a new aid package by late spring or early summer, the situation in Ukraine could become dire, U.S. officials told ABC News.

MORE: 2 years into war, Russian forces make offensive gains as Ukrainian weapons dwindle

Read the timeline of the first year of the war here.

ABC News' Nadine El-Bawab, Joe Simonetti, Patrick Reevell, Luis Martinez, Jon Haworth, Jolie Lash, Shannon K. Crawford, Fritz Farrow, Guy Davies, Tom Soufi Burridge, Oleksiy Pshemyskiy, Ibtissem Guenfoud, Kuba Kaminski, Anne Flaherty and Yulia Drozd contributed to this story.

Russia-Ukraine war: Key events in 2nd year of Russia's invasion of Ukraine originally appeared on abcnews.go.com