A Ukrainian drone hit a Tamanneftegaz fuel tank in the Port of Taman, Russia, at about 2:30 a.m. local time Wednesday, Kirill Fedorov, a pro-Russian blogger, said on his Telegram channel. The Port of Taman is in the Black Sea near the Kerch Strait.

The fire could be seen in a video circulating online.

Local authorities confirmed the fire, which "has been assigned the highest rank," the governor of the region said. A tank with petroleum products was hit by the drone and is burning, the governor said. No injuries were reported and there was no threat to residents, he added on his Telegram channel.

-ABC News' Tanya Stukalova

All drones that were used by Russians to attack Kyiv early Wednesday morning local time were shot down by Ukrainian air defense systems, the Kyiv City Military Administration said on Telegram.

There were no reported injuries or casualties, the military administration said.

This was the third attack on Kyiv in six days, the administration added.

-ABC News' Natalya Kushnir

Explosions were reported in Kyiv around 1:00 a.m. Wednesday local time, according to Suspilne, the Ukrainian public broadcaster.

The Ukrainian Air Defense Forces were activated in response, the Kyiv City Military Administration reported.

S-300 missiles belonging to Ukrainian Armed Forces were hit in Zaporizhzhia, the spokesman of the Odesa Regional Military Administration, Serhiy Bratchuk, said on Telegram.

Reports of damage, and number of people injured or killed were not immediately available.

-ABC News' Ellie Kaufman and Max Uzol

A 26-year-old U.S. Marine Corps veteran was killed in a mortar strike last month in Ukraine while working to evacuate civilians, his family confirmed to ABC News this week.

Cooper Andrews died on April 19 in the Bakhmut area, his cousin Willow Pastard, who is speaking on his family's behalf, told ABC News.

The State Department announced Monday that an American citizen died in Ukraine, though did not provide more details or an identity "out of respect for the family's privacy during this difficult time."

"We are in touch with the family and providing all possible consular assistance," a spokesperson for the agency said in a statement.

At least nine deaths of U.S. citizens who have volunteered to fight in Ukraine have been officially reported since the war began last year, according to the State Department.

-ABC News' Shannon Crawford

One year ago, with Ukraine's borders surrounded by what seemed to be a superior military force, many U.S. officials and analysts predicted a swift Russian blitz to Kyiv.

But after Russian President Vladimir Putin sent his more than 150,000 arrayed troops across the border, it soon became clear that a dual reassessment was in order: The Russian invaders were less potent than advertised, and the Ukrainians were unexpectedly stubborn and wily in the defense.

Some of the Russian troops weren’t even aware they were on a combat mission until Ukrainian bullets came cracking past them, according to U.S. officials. Meanwhile, Ukrainian forces stalled a massive Russian supply convoy through direct attacks and by destroying a key bridge. Only one week into the invasion, Putin's men were plagued with food and fuel shortages, morale running similarly low.

Kyiv stood.

"Putin assumed that Ukraine was an easy target, Putin assumed that Kyiv would easily fall, and Putin assumed that the world would stand by," U.S. Secretary of Defense Lloyd Austin said during a speech in Brussels last week. "But the Kremlin was wrong on every count."

Ukrainian forces were armed with more than grit.

They also had years of U.S. and NATO military training, plus American-made weapons, like anti-armor Javelins and anti-aircraft Stinger missiles. These made Russian vehicles vulnerable to ambush, and left Russian helicopter and jet pilots wary of flying over Ukrainian positions. Indeed, many airmen did not return from their sorties.

Despite astonishing losses of soldiers and vehicles, Putin has shown no inclination to end the conflict anytime soon. And despite its tenacity, Ukraine has also taken significant casualties, and is not able to produce enough of its own weapons and ammunition to keep up the fight.

Ukraine, after thwarting the advance on its capital, and later routing Russian forces from Kharkiv, now largely faces a battle of supply.

"When this war began, Russia had a larger population, a much bigger defense budget, a bigger military, bigger industrial base. So, this became an industrial war and a war of industrial bases," said Seth Jones, director of the International Security Program at the Center for Strategic and International Studies. "This is why Western industrial support has been so critical."

A key question now is, despite massive military aid packages and a promise to send even more, could the U.S. strategy ultimately result, not in a Ukrainian victory, but a stalemate in a years-long war of attrition?

-ABC News' Matt Seyler