Russia-Ukraine updates: Russian missiles hit close to nuclear reactors: IAEA director

The Pentagon has announced a new $1 billion military aid package for Ukraine.

The package includes more missiles for the HIMARS advanced rocket systems; 1,000 more Javelin anti-tank weapons; 55,000 rounds of artillery for 155mm howitzers; and armored vehicles.

"This package provides a significant amount of additional ammunition, weapons, and equipment that Ukrainians are using so effectively to defend themselves and will bring total U.S. security assistance to Ukraine to approximately $9.8 billion since the beginning of this Administration," Secretary of State Antony Blinken said in a statement.

The Treasury Department also announced Monday another $4.5 billion in direct economic assistance to help support Ukraine's government, including paying salaries and keeping hospitals and schools open.

-ABC News’ Luis Martinez and Sarah Kolinovsky

Two dry cargo ships loaded with export grain were scheduled to leave the Ukrainian ports of Chornomorsk and Pivdenne on Monday after a busy weekend that saw four additional cargo vessels sail through Ukrainian waters.

The vessel Sakura, carrying 11,000 tonnes of soy, was the first to leave the Ukrainian port of Pivdenne on Monday as part of an initiative to export grain from Ukraine, local media reported.

The ship set course for Italy in the company of another dry cargo carrier -- Arizona -- which left Chornomorsk, another Ukrainian Black Sea port, with 50,000 tonnes of corn on Monday. The Arizona vessel is bound for Turkey.

Another four-ship convoy left Ukraine on Sunday morning, carrying 170,000 tons of agricultural produce, Ukraine's Infrastructure Ministry said over the weekend.

Pope Francis welcomed the safe departure of the ships on Sunday while speaking at the noon-day Angelus prayer. “This event can be seen as a sign of hope,” the Pope said, adding that the export deal charts the path forward toward peace. “I sincerely hope that, following this path, we can put an end to the fighting and arrive at a just and lasting peace.”

So far, around 250,000 tonnes of corn, as well as 11,000 tonnes of soybeans, 6,000 tonnes of sunflower oil and 45,000 tonnes of sunflower meal have been exported from Ukraine on 10 ships since the first departure on Aug. 1, when the deal to establish safe corridors for ships to pass through was struck, according to a Reuters data tally.

Ukraine is planning to send up to five cargo ships a day from three Black Sea Ports in the following weeks, the local Sea Ports Authority said on Monday. Local authorities are also working to ensure that Ukrainian ports can receive at least three to five ships per day within two weeks, Infrastructure Minister Oleksandr Kubrakov said on Saturday.

The resumption of grain exports is being overseen by a Joint Coordination Centre in Istanbul, comprised of Russian, Ukrainian, Turkish and U.N. personnel.

Meanwhile, the very first ship with Ukrainian grain that left the port of Odesa on Aug. 1 has been delayed in Tripoli, Lebanon, according to Ihor Ostash, the Ukrainian Ambassador to Lebanon.

“We are waiting for the conclusion of the negotiation process. Following this vessel, 20 others are already ready to leave Odesa," the ambassador said on Sunday.

-ABC News' Edward Szekeres, Yuriy Zaliznyak, Fidel Pavlenko and Max Uzol

Actress Jessica Chastain was photographed with Ukrainian President Volodymyr Zelenskyy on Sunday in Kyiv following a meeting in which the Oscar winner expressed support for the country under siege by Russia.

"For us, such visits of famous people are extremely valuable," Zelenskyy wrote on his verified Telegram account. "Thanks to this, the world will hear, know and understand the truth about what is happening in our country even more."

In the post, Zelenskyy thanked Chastain for her support and published several photos of Chastain sitting at a table with Zelenskyy and two of his advisers.

Chastain has been vocal on social media regarding the plight Ukrainians are experiencing. In March, she tweeted photos published by Vogue Ukraine that highlighted the women being forced to give birth in bomb shelters are the start of the invasion.

-ABC News Christine Theodorou

Ukrainian President Volodymyr Zelenskyy said Russian forces shelled the Zaporizhzhia nuclear plant Friday.

Zelenskyy said forces twice struck the plant, which is in Russian-controlled territory in the southeast, and called the action "an act of terror," in a statement released on Telegram.

"Russia should be responsible for the very fact of creating a threat to the nuclear power plant," he said in the statement.

The facility is the largest nuclear power plant in Europe.

The Russian military, however, claimed it was a Ukrainian artillery strike that led to the reduction of activities of one power unit, and power falling at another.

They claimed 20 shells were fired at the city of Enerhodar and the power plant.

"Fortunately, the Ukrainian shells did not hit the oil and fuel facility and the oxygen plant nearby, thus avoiding a larger fire and a possible radiation accident," Russia’s defense ministry said, according to Reuters.

Earlier this week, the International Atomic Energy Agency officials said the situation at Zaporizhzhia was “out of control” as routine safety checks had not been observed. IAEA officials have appealed for access to the Russian-controlled plant.

-ABC News' Guy Davies