NATO is returning to the scene of one of its most controversial decisions to repeat a vow that Ukraine will join the military alliance one day

Recent Russian attacks have targeted Ukrainian energy infrastructure, which has plunged much of the country into darkness as winter sets in.

Ukraine's first lady says Russian soldiers must be held accountable.

Ukraine prepared for more Russian strikes against energy infrastructure on Monday in what appears to be a weekly pattern

With winter bearing down on the country, Moscow is launching a barrage of attacks on Ukraine’s energy infrastructure.

ABC News’ Marcus Moore reports with the latest developments on the war in Ukraine.

Crews are working hard to restore services like heat and power, following Russian strikes targeted critical infrastructure in Ukraine.

Michael McCaul and Mike Turner on "This Week" touted the GOP's support for Ukraine against Russia but said the House Republican majority will provide "accountability"

ABC News’ Martha Raddatz interviews Rep. Michael McCaul and Rep. Mike Turner on “This Week.”

Russia has resorted to firing dummy missiles while also attempting to knock out Ukraine's power grids, affecting the Ukrainian population as winter approaches.

ABC News’ Martha Raddatz reports from Kyiv on the latest in Ukraine on “This Week.”

Fleeing shelling, civilians have streamed out of the southern Ukrainian city whose recapture they had celebrated just weeks earlier

ABC News' correspondent Marcus Moore reports from Kyiv as a new barrage of Russian missiles cripples Ukrainian cities, forcing doctors to perform life-saving surgery using flashlights.

A Ukrainian family that resettled in America amid the war in Ukraine celebrated their first Thanksgiving in the U.S.

The intense firefight over Ukraine has the Pentagon rethinking its weapons stockpiles

The Ukrainian city is in the dark and without heat after Russian forces struck power plants and residential buildings.

A newborn baby was killed overnight in a Russian strike on a Ukrainian hospital overnight. The baby's mother survived.

The baby's mother survived the attack.

A punishing new barrage of Russian strikes on Ukrainian infrastructure has caused power outages across large parts of the country as well as neighboring Moldova, adding to damage to Ukraine’s power network and misery for civilians as winter begins

Amid the war in Ukraine, children have been caught in the middle, with claims of some being kidnapped and ABC News’ Britt Clennett reports on the fight to reunite some of those families.

After video surfaced suggesting Ukrainian fighters may have committed a war crime against Russian soldiers, Ukraine's prosecutor general announced an investigation.

Officials say Ukraine could face rolling blackouts through March because Russian airstrikes have caused what they call “colossal” damage to the power grid

Russian energy giant Gazprom has threatened to reduce natural gas supplies through the last pipeline heading to Europe via Ukraine, saying the amount it's supplying for Moldova is not ending up in the former Soviet republic

It's one of the most famous Orthodox Christian sites in the capital, Kyiv.

Speaking hours after Ukrainian President Zelenskyy called on him to be a "leader for peace," President Joe Biden detailed how the U.S. is providing aid to Ukraine.

The mayor of Melitopol was allegedly abducted by Russian forces on March 11.

Just weeks ago, the U.S. had refused to detail what weapons it was providing.

Unlike larger drones, it's not meant to return after its mission.

Meanwhile, Ukrainian officials are urging residents in liberated cities to evacuate as power outages spread across the country and winter approaches.

Advocates say Ukrainians are being turned away at the southern border.

Rafal Trzaskowski, the mayor of Warsaw in Poland, spoke out to say the country needs help with the refugee crisis Russia's invasion of Ukraine has caused.

Taking out Putin's artillery is vital as Russians increase shelling of cities.

Russian missile strikes hit the western Ukrainian city of Lviv Friday, marking the first strike on the city since the invasion began.

So far, the White House has argued most refugees want to stay in the region.

Sen. Dick Durbin, D-Ill., appeared on ABC's "This Week" Sunday.

The Russian anti-war editor appeared on ABC's "This Week" Sunday.

Amellia Anisovych, 7, is now a refugee in Poland, according to the Associated Press.

Doctors on Ukraine border say mental health is a top medical priority as refugees suffer from acute stress disorder.

Reporter's notebook: Escape from Mariupol, Ukraine

"It's things like this that change me as a person," Chmerkovskiy told "GMA."

Mykhailo Podolyak said he believes the talks are legitimate on Russia's side.

Administration officials did not specify a timeline for accepting these refugees.

Russian President Vladimir Putin's invasion of Ukraine has led some of the biggest companies in the world to change their business relationships with Russia.

President Joe Biden touched down Friday in Poland, the epicenter for millions fleeing Ukraine, to meet with U.S. troops and refugees as Russia's invasion continues.

The cost of direct damage to Ukraine's infrastructure amid Russia's ongoing invasion has reached almost an estimated $63 billion, according to a new analysis.

More than 4 million refugees, some pregnant, have fled Ukraine amid the invasion by Russia.

Grassroots groups are working together to rescue Ukrainian Holocaust survivors.

The first peace talks in two weeks between Ukraine and Russia concluded after five hours on Tuesday in Turkey with both sides reporting progress in the negotiations.

The U.S. is still skeptical that Russia is engaging genuinely in negotiations with Ukraine to end its month-long war against its neighbor.

Among the factors shaping the "David and Goliath" conflict has been Ukraine's "smart tactical use" of its anti-tank and anti-craft weapons.