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President Joe Biden walks to board Air Force One, Thursday, April 21, 2022, at Andrews Air Force Base, Md., en route to Portland, Ore. (AP Photo / Gemunu Amarasinghe)

The new package includes $800 million in military aid for much-needed heavy artillery, 144,000 rounds of ammunition and drones for the escalating battle in the Donbas region of eastern Ukraine. It builds on roughly $2.6 billion in military assistance that Biden previously approved.

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Firefighters work to extinguish a fire after an airstrike hit a tire shop in Lviv, Ukraine, Monday, April 18, 2022. (AP Photo / Mykola Tys)

Russia bombarded the western city of Lviv and numerous other targets across Ukraine on Monday in what appeared to be an intensified bid to grind down the country’s defenses while building up its own forces for a major ground offensive in the east.

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Ukrainian President Volodymyr Zelenskyy speaks via remote feed during a meeting of the UN Security Council, Tuesday, April 5, 2022, at United Nations headquarters. (AP Photo / John Minchillo)

Zelenskyy, appearing via video from Ukraine, told council members that civilians had been shot in the back of the head after being tortured, blown up with grenades in their apartments and crushed to death by tanks while in cars.

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President Joe Biden speaks to the media at Fort Lesley J. McNair, Monday, April 4, 2022, as he returns to Washington and the White House after spending the weekend in Wilmington, Del. (AP Photo/Andrew Harnik)

President Joe Biden’s comments to reporters came after Ukraine President Volodymyr Zelenskyy visited Bucha, one of the towns surrounding Kyiv where Ukrainian officials say the bodies of civilians have been found. Zelenskyy called the Russian actions “genocide” and called for the West to apply tougher sanctions against Russia.

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Halyna Falko looks at the destruction caused after a Russian attack inside her house near Brovary, on the outskirts of Kyiv, Ukraine, Monday, March 28, 2022. (AP Photo / Rodrigo Abd)

While hinting at possible concessions, President Zelenskyy also stressed that Ukraine’s priority is ensuring its sovereignty and its “territorial integrity” — preventing Russia from carving up the country, something Ukraine and the West say could now be Moscow’s goal.

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A serviceman carries the photo of Capt. Andrei Paliy, a deputy commander of Russia's Black Sea Fleet, during a farewell ceremony in Sevastopol, Crimea, Wednesday, March 23, 2022. Paliy was killed in action during fighting with Ukrainian forces in the Sea of Azov port of Mariupol. (AP Photo)

A senior NATO military official said the alliance’s estimate was based on information from Ukrainian authorities, what Russia has released — intentionally or not — and intelligence gathered from open sources. The official spoke on condition of anonymity under ground rules set by NATO.

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Displaced Ukrainians on a Poland-bound train bid farewell in Lviv, western Ukraine, Tuesday, March 22, 2022. (AP Photo / Bernat Armangue)

Civilians fleeing Mariupol said the city was under relentless bombardment, with block after block of destroyed buildings and corpses in the streets. But the Kremlin’s ground offensive in other parts of the country advanced slowly or not at all, knocked back by lethal Ukrainian hit-and-run attacks.

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A man walks in his apartment ruined after the Russian shelling in Kyiv, Ukraine, Monday, March 21, 2022. At least eight people were killed in the attack. (AP Photo / Efrem Lukatsky)

As Russia intensified its effort to pound Mariupol into submission, its ground offensive in other parts of Ukraine has become bogged down. Western officials and analysts say the conflict is turning into a grinding war of attrition, with Russia bombarding cities.

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Ukrainian President Volodymyr Zelenskyy speaks to the U.S. Congress by video to plead for support as his country is besieged by Russian forces, at the Capitol in Washington, Wednesday, March 16, 2022. (AP Photo / J. Scott Applewhite, Pool)

Livestreamed into the Capitol complex, Ukrainian President Volodymyr Zelenskyy said the U.S. must sanction Russian lawmakers and block imports. But rather than an enforced no-fly zone that the White House has resisted, he instead sought other military aid to stop Russian assault.

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People clear debris outside a medical center damaged after parts of a Russian missile, shot down by Ukrainian air defense, landed on a nearby apartment block, according to authorities, in Kyiv, Ukraine, Thursday, March 17, 2022. (AP Photo / Vadim Ghirda)

Hundreds of civilians had been taking shelter in the grand, columned theater in central Mariupol after their homes were destroyed in three weeks of fighting in the southern port city.

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Volunteers pass an improvised path under a destroyed bridge as they evacuate an elderly resident in Irpin, some 25 km (16 miles) northwest of Kyiv, Friday, March 11, 2022. Kyiv northwest suburbs such as Irpin and Bucha have been enduring Russian shellfire and bombardments for over a week prompting residents to leave their home. (AP Photo / Efrem Lukatsky)

Russia widened its offensive in Ukraine on Friday, striking airfields in the west and a major industrial city in the east, while the huge armored column that had been stalled for over a week outside Kyiv was on the move again, spreading out into forests and towns near the capital.

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In this image provided by the White House, President Joe Biden listens during a secure video call with French President Emmanuel Macron, German Chancellor Olaf Scholz and British Prime Minister Boris Johnson in the Situation Room at the White House Monday, March 7, 2022, in Washington. (Adam Schultz / The White House via AP)

The action follows pleas by Ukrainian President Volodymyr Zelenskyy to U.S. and Western officials to cut off the imports, which had been a glaring omission in the massive sanctions put in place on Russia over the invasion.

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People cross an improvised path under a destroyed bridge while fleeing the town of Irpin close to Kyiv, Ukraine, Monday, March 7, 2022. (AP Photo / Efrem Lukatsky)

A third round of talks between the two sides ended with a top Ukrainian official saying there had been minor, unspecified progress toward establishing safe corridors that would allow civilians to escape the fighting. Russia’s top negotiator said he expects those corridors to start functioning Tuesday.

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  Ukrainians crowd under a destroyed bridge as they try to flee crossing the Irpin river in the outskirts of Kyiv, Ukraine, Saturday, March 5, 2022. (AP Photo / Emilio Morenatti)

Food, water, medicine and almost all other supplies were in desperately short supply in the port city of Mariupol, where Russian and Ukrainian forces had agreed to an 11-hour cease-fire that would allow civilians and the wounded to be evacuated. But Russian attacks quickly closed the humanitarian corridor, Ukrainian officials said.

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Newlyweds Maria and David during their ceremony at a home, Saturday, March 5, 2022, in Oak Park, Ill. Maria, whom is from Ukraine, is headed back there to volunteer, a few days after she was married. (AP Photo / Matt Marton)

Maria and her fiancé, David, married Saturday before about 20 people in the backyard of an Oak Park home. On Monday, she plans to fly to Poland, then make her way to the Ukrainian border, ultimately aiming to volunteer to fight for her home country.

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Militia men carry the coffin with the body of Volodymyr Nezhenets, 54, during his funeral in the city of Kyiv, Ukraine, Friday, March 4, 2022. A small group of reservists are burying their comrade, Nezhenets, who was one of three killed on Feb. 26 in an ambush Ukrainian authorities say was caused by Russian ‘saboteurs.’ (AP Photo / Emilio Morenatti)Militia men carry the coffin with the body of Volodymyr Nezhenets, 54, during his funeral in the city of Kyiv, Ukraine, Friday, March 4, 2022. A small group of r

Russian troops Friday seized the biggest nuclear power plant in Europe after a middle-of-the-night attack that set it on fire and briefly raised worldwide fears of a catastrophe in the most chilling turn in Moscow’s invasion of Ukraine yet.