Ukrainian Prime Minister Denys Shmyhal said Sunday in an exclusive interview with ABC "This Week" that the besieged city of Mariupol has not yet fallen despite Russian demands that Ukrainians surrender.

       "There [are] still our military forces, our soldiers, so they will fight until the end," Shmyhal told "This Week" Anchor George Stephanopoulos.

       Ddp Images/Sipa USA via AP, FILE

       Prime Minister of Ukraine Denys Shmyhal is pictured during a joint briefing with Executive Vice-President of the European Commission Valdis Dombrovskis in Kyiv, Ukraine, Jan. 31, 2022.

       Mariupol is a strategic city for Russia because it will allow Russian forces in the south to connect with troops in the Donbas region. It will also give Russia a key port.

       Shmyhal said even though the city remains in Ukrainian control, its residents are suffering.

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

       Stephanopoulos asked Schmyhal about the Austrian chancellor's assessment that Putin believes he is winning the war. "Has the tide turned?" he asked.

       Schmyhal replied that only one big city "is under control of Russian military forces. But all of the rest of the cities are under Ukrainian control."

       MORE: Russia-Ukraine live updates

       Russia's Moskva battleship sank in the Black Sea on Wednesday. The Russian Defense Ministry said Thursday its flagship vessel lost stability when it was towed to a port. Russia said the ship first sustained damage during a fire started by the detonation of ammunition, but Ukrainian government officials claimed its armed forces fired missiles that struck the vessel, causing damage.

       MORE: Russian warship sinks after Ukraine claims it struck ship with missiles

       On Saturday, Russia continued attacks across Ukraine, including in the capital, Kyiv. The Ukrainian president's office reported missile strikes and shelling in eight regions across the country.

       Stephanopoulos asked Schmyhal if peace talks between Ukraine and Russia have reached a dead end.

       Schmyhal said Ukraine was open to diplomacy, but if Russia does not want to negotiate, Ukraine will continue to fight.

       "We will not surrender; we will not leave our country, our families, our land," Schmyhal said. "So we will fight absolutely to the end, to win in this war."

       The United Nations reported on Friday that Russian troops have killed 1,982 Ukrainian civilians, including 162 children.

       MORE: What is genocide and has the legal threshold been crossed in Ukraine?

       President Joe Biden authorized $800 million more in military aid last week, after referring to Russia's actions in Ukraine as "genocide." Stephanopoulos asked the Ukrainian Prime Minister what more the country needs.

       "We are so grateful to American people, especially to President Bident for [the] support of Ukraine," Schmyhal said. "Only half of our economy is working, so we ask for financial support."

       "We need more sanctions from West partners. We need more ammunition to protect our country and European borders," Schmyhal added.