LVIV, Ukraine (AP) -- Waves of Russian missiles pounded a military training base near Ukraine's western border with NATO member Poland, killing 35 people, Ukrainian authorities said Sunday. The strike followed Russian threats to target foreign weapon shipments that are helping Ukrainian fighters defend their country against Russia's grinding assault.
More than 30 Russian cruise missiles targeted the sprawling facility that is less than 25 kilometers (15 miles) from the closest border point with Poland, according to the governor of Ukraine's western Lviv region. Poland is a transit route for Western military aid to Ukraine, and the United States increased the number of America troops deployed there.
The training base near Yavoriv appears to be the westernmost target struck during Russia's 18-day invasion. The facility, also known as the International Peacekeeping and Security Center, has long been used to train Ukrainian military personnel, often with instructors from the U.S. and other NATO countries.
The base has also hosted international NATO drills and a senior NATO official, Admiral Rob Bauer, previously hailed it as embodying "the spirit of military cooperation" between Ukraine and international forces. As such, the site symbolizes a longstanding Russian complaint: that the 30-member Western military alliance has expanded in Eastern Europe too close to Russian territory.
One of Moscow's stated conditions for ending the hostilities in Ukraine is for the country to drop its ambitions to join NATO.
Lviv governor Maksym Kozytskyi said most of the Russian missiles fired Sunday "were shot down because the air defense system worked." The ones that got through through killed at least 35 people and wounded 134, he said.
NATO said Sunday that it currently does not have any personnel in Ukraine. White House national security adviser Jake Sullivan said the West would respond if Russia's armaments travel outside Ukraine and hit any NATO members, even accidentally.
President Joe Biden "has been clear, repeatedly, that the United States will work with our allies to defend every inch of NATO territory and that means every inch," Sullivan said on CBS News' "Face the Nation."
The city of Lviv itself so far has been spared the scale of destruction unfolding to its east and south. Its population of 721,000 has swelled during the war with residents escaping other bombarded population centers and as a waystation for the nearly 2.6 million refugees who fled the country.
Ukrainian and European leaders have pushed with limited success for Russia to grant safe passage to civilians trapped by fighting. Ukrainian authorities said more than 10 humanitarian corridors would open Sunday, with agreement from Russia, including from the battered and besieged port city of Mariupol, where authorities say more than 1,500 people have been killed.
Ukrainian President Volodymyr Zelenskyy said in a video address that a convoy carrying 100 tons of humanitarian aid was on its way to Mariupol, and all necessary diplomatic efforts have been taken to make sure it reaches those in need. Capturing Mariupol and other ports on the Azov Sea could allow Russia to establish a land corridor to Crimea, which Russia seized from Ukraine in 2014.
Ukrainian officials have accused Russia of failing to honor previous pledges to withhold fire along temporary evacuation routes. Zelenskyy said Ukrainian authorities still have managed to evacuate nearly 125,000 people from areas where hostilities are ongoing.
But continued fighting on multiple fronts heaped further misery on the country Sunday and provoked renewed international outrage.
In the southern Ukrainian city of Mykolaiv, near the Black Sea, authorities reported nine people killed in bombings. Russian forces advancing from Crimea were attempting to circumvent Mykolaiv on what appeared to be a westward push toward the Black Sea port of Odesa, Britain's Defense Ministry said.
Russian fighters also fired at the airport in the western city of Ivano-Frankivsk, which is less than 150 kilometers (94 miles) north of Romania and 250 kilometers (155 miles) from Hungary, countries that also are NATO allies. The airport, which includes a military airfield as well as a runway for civilian flights, also was targeted Friday.
Ukrainian authorities said Russian airstrikes on a monastery and a children's resort in the eastern Donetsk region hit spots where monks and refugees were sheltering, wounding 32 people.
Another airstrike hit a westward-bound train evacuating people from the east, killing one person and injuring another, Donetsk's chief regional administrator said.
To the north, in the city of Chernihiv, one person was killed and another injured in a Russian airstrike that destroyed a residential block, emergency services said.
Around the capital, Kyiv, a major political and strategic target for the invasion, fighting also intensified, with overnight shelling in the northwestern suburbs and a missile strike Sunday that destroyed a warehouse to the east.
In Irpin, a suburb about 12 miles (20 kilometers) northwest of central Kyiv, bodies lay out in the open Saturday on streets and in a park.
"When I woke up in the morning, everything was covered in smoke, everything was dark. We don't know who is shooting and where," resident Serhy Protsenko said as he walked through his neighborhood with explosions sounding in the distance.
Chief regional administrator Oleksiy Kuleba said Russian forces appeared to be trying to blockade and paralyze the capital with day and night shelling of the suburbs. Kuleba said Russian agents were in the capital and its suburbs, marking out possible future targets.
He vowed that any all-out assault would meet stiff resistance, saying: "We're getting ready to defend Kyiv, and we're prepared to fight for ourselves."
After talks aimed at reaching a cease-fire again failed Saturday, the U.S. announced plans to provide another $200 million to Ukraine for weapons. Russian Deputy Foreign Minister Sergei Ryabkov warned other nations that sending equipment to bolster Ukraine's military was "an action that makes those convoys legitimate targets."
Zelenskyy has accused Russia of trying to break his country apart, as well as starting "a new stage of terror" with the alleged detention of a mayor from a city west of Mariupol. He also alleged Saturday that Russians were using blackmail and bribery in an attempt to force local officials in the southern Kherson region to form a "pseudo-republic" like those in the two eastern regions where pro-Russian separatists began fighting Ukrainian forces in 2014.
"Ukraine will stand this test. We need time and strength to break the war machine that has come to our land," Zelenskyy said during his nightly address to the nation Saturday.
Zelenskyy again deplored NATO's refusal to declare a no-fly zone over Ukraine and said Ukraine has sought ways to procure air defense assets, though he didn't elaborate. NATO has said that imposing a no-fly zone could lead to a wider war with Russia. U.S. President Joe Biden announced another $200 million in aid to Ukraine, with an additional $13 billion included in a bill that has passed the House and should pass the Senate within days.
The Russian invaders appear to have struggled more than expected against determined Ukrainian fighters. Still, Russia's stronger military threatens to grind down Ukrainian forces. Zelenskyy reported Saturday that 1,300 Ukrainian soldiers had died since the Russian invasion began Feb. 24.
Russian forces have hit at least two dozen hospitals and medical facilities, according to the World Health Organization. Ukraine's Prosecutor General's office said Sunday that at least 85 children have been killed in the Russian offensive and more than 100 wounded. completely destroyed.
The United Nations has said the fighting has displaced millions of Ukrainians within the country on top of the millions who have left.
In some of his strongest denunciations yet of the war in Ukraine, Pope Francis on SUnday decried the "barbarianism" of the killing of children and other civilians and pleaded for the attacks to end "before cities are reduced to cemeteries." Francis said Mariupol, the southern city which "bears the name" of the Virgin Mary, has "become a city martyred by the heartbreaking war that is devastating Ukraine."
"In the name of God, I ask: 'Stop this massacre,'" Francis said, sparking applause from a crowd of 25,000 gathered in St. Peter's Square, some of whom held Ukrainian flags.