Italy's Ministry of Economy and Finance on Saturday impounded the Scheherazade, a yacht said to be worth $700 million, which allegedly belonged to Russian President Vladimir Putin.

The superyacht has been under investigation for months for possible connections to Putin and other Russians sanctioned by the EU. The Scheherazade was being refurbished in the Tuscan port of Marina di Cararra.

The investigation conducted by Italian authorities found significant economic and business connections between the owner of the Scheherazade and prominent people in the Russian government and other Russians sanctioned by the EU.

Italian officials also recommended to the EU Council that the owner of the boat be added to the list of Russians sanctioned for the war in Ukraine.

The war in Ukraine is taking a toll on Russia's military, the U.K. Ministry of Defense said Saturday.

"The conflict in Ukraine is taking a heavy toll on some of Russia’s most capable units and most advanced capabilities. It will take considerable time and expense for Russia to reconstitute its armed forces following this conflict," the ministry said in a statement.

Adding, "It will be particularly challenging to replace modernized and advanced equipment due to sanctions restricting Russia’s access to critical microelectronic components."

At least one T-90M, Russia's newest tank, with its strongest armor, has been destroyed in the fighting, the Ministry of Defense said.

The Russian military has approximately 100 T-90M tanks currently in service, including those in Ukraine, but the system's upgraded armor "remains vulnerable if unsupported by other elements," the defense ministry said.

First Lady Jill Biden kicked off the first day of her overseas trip by visiting Mihail Kogalniceanu Air Base in Romania, where she met with U.S. troops and NATO military leadership.

The U.S. deployed troops to the base, which is about 60 miles from the border with Ukraine, in the leadup to Russia's invasion of Ukraine.

Prior to departing the U.S. last night, the first lady told reporters, "It was so important to the president and to me that the Ukrainian people know that we stand with them."

Biden drew cheers Friday when she greeted soldiers with a bottle of ketchup in hand -- a commodity that has been in short supply on the base, according to her spokesperson.

Wearing a Beau Biden Foundation hat, the first lady helped serve mac and cheese and potatoes and shook hands and took photos with the service members. She also participated in a special story-time with United Through Reading, an organization that connects military families with a deployed service member through video recordings and virtual book readings.

Biden also met with members of the Delaware National Guard before departing the base for Bucharest.

-ABC News' Allison Pecorin and Molly Nagle

The U.S. has announced another package of security assistance that will provide "additional artillery munitions, radars, and other equipment to Ukraine," according to a Friday afternoon statement from President Joe Biden.

The U.S. will provide up to $150 million in new security assistance for Ukraine, according to a memorandum from Biden.

"With today’s announcement, my Administration has nearly exhausted funding that can be used to send security assistance through drawdown authorities for Ukraine," Biden said in the statement. "For Ukraine to succeed in this next phase of war its international partners, including the U.S., must continue to demonstrate our unity and our resolve to keep the weapons and ammunition flowing to Ukraine, without interruption. Congress should quickly provide the requested funding to strengthen Ukraine on the battlefield and at the negotiating table."

The package includes 25,000 155mm artillery rounds, counter-artillery radars, electronic jamming equipment, field equipment and spare parts, according to Pentagon spokesperson John Kirby.

"Capabilities in this package are tailored to meet critical Ukrainian needs for today's fight as Russian forces continue their offensive in eastern Ukraine," Kirby said in a statement.

This marks the ninth drawdown of equipment from Department of Defense inventories for Ukraine since August 2021, according to Kirby.

-ABC News' Molly Nagle

Mariupol has not yet fallen, despite Russia's demands that Ukrainian troops defending the besieged Ukrainian port city surrender, according to Ukrainian Prime Minister Denys Shmyhal.

"There [are] still our military forces, our soldiers, so they will fight until the end," Shmyhal told ABC News' George Stephanopoulos in an exclusive interview Sunday on "This Week."

Mariupol is a strategic city for Moscow because it would allow Russian forces in the south to connect with troops in eastern Ukraine's contested Donbas region. It would also give Moscow a key port.

Although Mariupol remains under the Ukrainian government's control, Shmyhal said the city's residents are suffering.

"They have no water, no food, no heat, no electricity," he said. "They ask all of our partners to support and help stop this humanitarian catastrophe."

-ABC News' Monica Dunn