At least three people were killed and six others were injured in the Kharkiv area from ongoing shelling by Russian forces, according to the Kharkiv regional governor, Oleg Synegubov.

-ABC News' Will Gretsky

Oleksiy Danilov, Ukraine's secretary of the National Security and Defense Council, told ABC News that "it will be difficult for Ukraine to win this war without speeding up the supply of modern weapons."

He added, "The country is ready for long-term resistance, because we are fighting for our freedom."

This comes as the Donetsk People's Republic claims an advance in territory.

DPR Foreign Minister Natalia Nikonorova told reporters, "We can say that the allied forces -- the DPR militia and units of the Russian Defense Ministry -- are in control of over 70% of the territory."

There is evidence of Russian vessels departing "from near Ukraine with their cargo holds full of grain," a U.S. Department of State spokesperson told ABC News on Monday night.

The Ukrainian Ministry of Foreign Affairs has reported that Russia seized at least 400,000 to 500,000 tons of grain worth over $100 million, according to the State Department spokesperson.

"Ukraine's MFA also has numerous testimonies from Ukrainian farmers and documentary evidence showing Russia's theft of Ukrainian grain," the spokesperson said.

The news of Ukrainian grain aboard Russian ships partly confirms a recent report by The New York Times that Moscow is seeking to profit off of grain plundered from Ukraine by selling the product while subverting sanctions. Ukraine has already accused Russia of shipping the stolen grain to buyers in Syria and Turkey.

Russia and Ukraine -- often referred to collectively as Europe's breadbasket -- produce a third of the global supply of wheat and barley, but Kyiv has been unable to ship exports due to Moscow's offensive. A Russian blockade in the Black Sea, along with Ukrainian naval mines, have made exporting siloed grain virtually impossible and, as a result, millions of people around the world -- particularly in Africa and the Middle East -- are now on the brink of famine.

-ABC News' Shannon Crawford

Two planes -- a Gulfstream G650 and a Boeing 787 -- have been grounded after federal prosecutors said their owner, Russian oligarch Roman Abramovich, violated U.S. sanctions by flying the aircraft to Moscow in March.

The Boeing has been in the United Arab Emirates since about March 4, 2022, and the Gulfstream has been in Russia since about March 15, 2022.

The sanctions require a license for any U.S.-made aircraft to fly to Russia. The sanctions also prohibit an aircraft that is owned, controlled or under charter or lease by a Russian national from being flown to Russia.

"No licenses were applied for or issued. Nor was any license exception available, including because the Boeing and the Gulfstream were each owned and/or controlled by a Russian national: Roman Abramovich," said the affidavit supporting a seizure warrant.

The Boeing plane is believed to be among the most expensive private aircraft in the world, worth $350 million, the affidavit said.

-ABC News' Aaron Katersky

Russia's invasion of Ukraine has already engaged around 330,000 Russian personnel, Brigadier General Oleksiy Hromo of the General Staff of the Ukrainian Armed Forces told local media on Thursday.

“[Russian] groups at various axes are close to 150,000 strong. If we add their air and sea components, there are about 220,000 military personnel,” Hromo said. Russia also deployed “units of the national army combat reserve, the federal service of guard forces, and mobilization units,” the Brigadier General added.

Hromo's sobering account came on the back of claims made by a top Ukrainian official earlier on Wednesday that revealed mounting Ukrainian casualties. Up to 1,000 Ukrainian soldiers are being killed or wounded each day in the Donbas region of eastern Ukraine, with 200 to 500 killed on average and many more wounded, said David Arakhamia, who heads the presidential faction in the Ukrainian parliament.

In early June, Ukrainian President Volodymyr Zelenskyy said daily fatalities among Ukrainian ranks at the Donbas front were between 60 to 100 troops.

Arakhamia, one of Zelenskyy's closest advisers who oversees Ukraine's stalled negotiations with Russia, has been leading a Ukrainian delegation in Washington this week in a bid to lobby the Biden administration and Congress.

Arakhamia's team want to see the pace of weapons shipments increased and is pushing for a designation of Russia as a state sponsor of terrorism.

-ABC News' Edward Szekeres, Yuriy Zaliznyak, Yulia Drozd and Max Uzol