Ukrainian President Volodymyr Zelenskyy outlined his agenda for the NATO summit in Vilnius in his evening address.

Zelenskyy said the Ukrainian government is "working to make the algorithm for gaining membership as clear and fast as possible."

The president also added, in regards to the summit, "there may be good weaponry-related news."

"The priorities are absolutely clear: air defense for our cities, for all communities throughout the country, we are working to create a full-fledged sky shield," he said.

-ABC News' Will Gretsky

Russian forces hit a residential neighborhood Sunday in the Orikhiv, Zaporizhzhia region by a guided aerial bomb during the distribution of humanitarian aid, Ukrainian officials said.

At least seven people were killed and 11 others were injured in the blast, according to the regional military administration.

-ABC News' Will Gretsky

Russian forces are suffering an average of 400 casualties daily, according to a report from the U.K.'s Ministry of Defence.

The report said that Russia is struggling with "a crisis of combat medical provision."

"It is likely that many dedicated military hospitals are being reserved for officer casualties," the report said.

The Ministry of Defence added that half of Russian fatalities in the last 17 months could have been prevented with proper first aid.

-ABC News' Will Gretsky

Ukraine Deputy Minister of Defense Hanna Malyar released a statement Monday with updates on the ongoing counteroffensive.

Malyar said that Ukrainian forces liberated more than 14 square kilometers of territory from Russian forces last week, the majority of which came from the south.

The minister added that Russian forces are "on the defensive" in the direction of Bakhmut.

"The defense forces of Ukraine were able to capture the main heights near Bakhmut and have been holding the fortress city under fire control for several days," Malyar said.

-ABC News' Will Gretsky

Ukrainian President Volodymyr Zelenskyy and U.S. President Joe Biden are set to meet in Lithuania’s capital on Wednesday afternoon, a day after NATO leaders announced during a summit that Ukraine will be allowed to join the alliance "when allies agree and conditions are met" but didn't offer a timeline.

Earlier Wednesday, Zelenskyy held a joint press conference with NATO Secretary-General Jens Stoltenberg, fielding many questions from reporters about Ukraine's path to NATO membership. The Ukrainian president took a noticeably softer tone compared to his remarks the previous day criticizing the lack of a timeline as "unprecedented and absurd."

Zelenskyy told reporters it's difficult as NATO partners are living under different conditions, whereas in Ukraine "survival" matters. He said he understands some people are "afraid" to talk about Ukraine joining NATO because "nobody is willing to have a world war." He acknowledged that his country cannot be a member of the alliance while a war is going on within its borders, but he said "signals are important."

When asked about his upcoming meeting with Biden and how he plans to convince the U.S. president that Ukraine is ready for NATO membership, Zelenskyy responded with gratitude to the United States and confidence that Ukraine will join the alliance once Russia's war is over.

"I'm grateful to President Biden and to the Congress and to the people of United States that are truly the leaders in support and assistance to Ukraine. We highly appreciate this," the Ukrainian president told reporters. "Not planning to find any arguments for making sure that President Biden would see us in NATO. I believe that those arguments, they should be mutual because it's all about this security, the East, the European continent, the Eastern Flank of NATO. And I believe that NATO needs us just as we need NATO. And I believe that this is absolutely fair. I am confident that after the war, Ukraine will be in NATO. We will be doing everything possible to make it happen so that we with the United States would have a same understanding and same vision."

-ABC News' Molly Nagle and Joe Simonetti