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

White House national security advisor Jake Sullivan hinted Thursday of more sanctions coming against Russia in the "next week or two" aimed at targeting ways Moscow is evading sanctions already imposed.

“Where our focus will be over the course of the coming days is on evasion,” Sullivan said Thursday at the Economic Club of Washington. “As Russia tries to adjust to the fact that it’s under this massive economic pressure, what steps do they take to try to evade our sanctions and how do we crack down on that? And I think we'll have some announcements in the next week or two that identify targets that are trying to facilitate that evasion both inside Russia and beyond."

When Sullivan was asked whether sanctions will automatically be lifted if a negotiated peace deal between Russia and Ukraine is worked out, he appeared cautious with his words, saying, “a lot of that depends on what the shape and scope” of the agreement is.

“A lot of it depends on what the Ukrainians, in consultation with us and the Europeans come to agree to," Sullivan said. "You know, we're not going to do a deal over the head of the Ukrainians where we give a bunch of sanctions relief to Russia. But if some measure of sanctions relief were built in to some credible diplomatic solution led by the Ukrainians, that's something that we would happily discuss."

But Sullivan said Russian oligarchs shouldn't expect to ever get back their yachts and other assets seized under sanctions that have been imposed, saying the ultimate goal is "not to give them back” once the war is over.

“The president is actively looking at how we can deal with the fact that as we seize these assets, our goal is not to give them back. Our goal is to put them to a better use than that," Sullivan said. "But I'll be careful in what I say today because there's an ongoing kind of policy process around how we end up dealing with that question. But, rest assured, that the goal is not just to sit on them for a while."

-ABC News' Justin Gomez