Russia-Ukraine updates: 2 US veterans who joined Ukrainian forces missing

The Americans, Andy Tai Ngoc Huynh and Alexander Drueke, are both from Alabama.

Russian President Vladimir Putin's "special military operation" into neighboring Ukraine began on Feb. 24, with Russian forces invading from Belarus, to the north, and Russia, to the east. Ukrainian troops have offered "stiff resistance," according to U.S. officials.

The Russian military has since launched a full-scale ground offensive in eastern Ukraine's disputed Donbas region, capturing the strategic port city of Mariupol and securing a coastal corridor to the Moscow-annexed Crimean Peninsula.

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Latest headlines:

Here's how the news is developing. All times Eastern.
May 18, 2022, 2:21 PM EDT

Russian offensive effort shrinking, incremental progress toward Black Sea: Pentagon

Russian offensive operations in Donbas are becoming more modest, shrinking both in size and scale, according to a senior U.S. defense official.

A Ukrainian soldier from an intelligence surveys a hole opened up by a Russian air strike, on the outskirst of the separatist region of Donetsk, Donbas, Ukraine, May 17, 2022.
Daniel Ceng Shou-yi/ZumaPress

The Russians are making little progress so far in Donbas, with lots of back-and-fourth between both sides, according to the official.

"We see them hew very closely to their doctrine of artillery fire then a font of frontal attack by formations that are small, and in some cases, not fully resourced, fully manned, fully strong. And they get rebuffed by the Ukrainians," the official said.

Russian forces are also still suffering from poor communication between commanders and are having other coordination issues, according to the official.

To the northeast of Kharkiv, Ukrainian forces continue to push Russian troops back toward their border, according to the official.

PHOTO: A dead Russian soldier lies next to a destroyed school in Vilkhivka, Ukraine,  May 18, 2022.
A dead Russian soldier lies next to a destroyed school in Vilkhivka, Ukraine, May 18, 2022. In recent weeks Ukrainian forces have advanced towards the Russian border after Russia's offensive on Kharkiv, Ukraine's second largest city stalled.
John Moore/Getty Images

A cyclist brandishes a Ukraine flag in the disputed and reclaimed villages between Mykolaiv and Kherson, Ukraine, May 15, 2022.
Laine Nathan/Abacapress.com

Russian forces are making some progress pushing closer toward the Black Sea from between Kherson and Mykolayiv, according to the official. The official said it is not clear what the intent is for this line of advance, but the U.S. sees no signs of an imminent naval assault at this time.

PHOTO: Debris of a burned tank is seen in Mala Rohan' village near Kharkiv, Ukraine, May 18, 2022.
Debris of a burned tank is seen in Mala Rohan' village near Kharkiv, Ukraine, May 18, 2022. Russian troops were recently pushed out from Kharkiv's outskirts by the Ukrainian army.
Sergey Kozlov/EPA-EFE/Shutterstock

The U.S. believes Russia is "certainly trying" to disrupt to flow of military aid moving through Ukraine, but there have been no indications that it has had any success, according to the official.

Three of the eleven Mi-17 helicopters, more than 200 of the 300 Switchblade drones and nearly 10 Phoenix Ghost drones that the U.S. has promised Ukraine have been delivered, according to the official. The Ukrainians have told the Pentagon that 79 of the 90 U.S. howitzers that were delivered are now being used in combat.

-ABC News' Matt Seyler

May 18, 2022, 1:56 PM EDT

US Embassy reopens in Kyiv

U.S. Secretary of State Antony Blinken announced Wednesday that the U.S. is officially resuming operations at its embassy in Kyiv.

"The Ukrainian people, with our security assistance, have defended their homeland in the face of Russia’s unconscionable invasion, and, as a result, the Stars and Stripes are flying over the Embassy once again," Blinken said in a statement.

The U.S. has put in place additional measures to increase the safety for its staff and enhanced its security measures and protocols.

"We are committed to confronting the challenges ahead," Blinken said. "We reaffirm our commitment to the people and government of Ukraine, and we look forward to carrying out our mission from the U.S. Embassy in Kyiv."

May 18, 2022, 9:53 AM EDT

Finland, Sweden formally submit applications to join NATO

Finland and Sweden formally submitted their applications to join NATO to Secretary General Jens Stoltenberg Wednesday morning at the alliance’s Brussels headquarters.

NATO Secretary-General Jens Stoltenberg poses with documents presented by Finland's Ambassador to NATO Klaus Korhonen and Sweden's Ambassador to NATO Axel Wernhoff during a ceremony to mark the applications for membership in Brussels, on May 18, 2022.
NATO Secretary-General Jens Stoltenberg poses with documents presented by Finland's Ambassador to NATO Klaus Korhonen and Sweden's Ambassador to NATO Axel Wernhoff during a ceremony to mark their countries' applications for membership in Brussels, on May 18, 2022.
Johanna Geron/POOL/AFP via Getty Images

Stoltenberg welcomed the requests, saying, "This is a good day, at a critical moment for our security," according to NATO.

"Every nation has the right to choose its own path. You have both made your choice, after thorough democratic processes. And I warmly welcome the requests by Finland and Sweden to join NATO," Stoltenberg said Wednesday.

Adding, "You are our closest partners. And your membership in NATO would increase our shared security."

May 18, 2022, 9:25 AM EDT

Russian soldier pleads guilty to killing civilian

Russian Sgt. Vadim Shyshimarin pleaded guilty Wednesday to shooting a 62-year-old Ukrainian man on Feb. 28. The guilty plea carries a life sentence.

It's the first trial Ukraine has conducted for an act that could be considered a war crime.

Asked by the presiding judge whether he accepted his guilt, Shyshimarin said: "Yes. Fully yes."

Kremlin spokesman Dmitri Peskov dismissed the proceedings on Wednesday, telling reporters that accusations leveled against Russian soldiers by Ukraine were "simply fake or staged."

Vadim Shishimarin is the first Russian soldier to face a war crimes trial in Ukraine.
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Russian soldier pleads guilty to killing civilianVadim Shishimarin is the first Russian soldier to face a war crimes trial in Ukraine.
ABCNews.com

-ABC News' Joe Simonetti

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