KYIV, UKRAINE -- Russia unleashed a string of attacks Monday against rail and fuel installations deep inside Ukraine, far from the front lines of Moscow's new eastern offensive, as Russia's top diplomat warned against provoking "World War III" and said the threat of a nuclear conflict "should not be underestimated."

The U.S., meanwhile, moved to rush more weaponry to Ukraine and said the assistance from the Western allies is making a difference in the 2-month-old war.

"Russia is failing. Ukraine is succeeding," U.S. Secretary of State Antony Blinken declared, a day after he and the U.S. secretary of defence made a bold visit to Kyiv to meet with President Volodymyr Zelenskyy.

Blinken said Washington approved a $165 million sale of ammunition -- non-U.S. ammo, mainly if not entirely for Ukraine's Soviet-era weapons -- and will also provide more than $300 million in financing to buy more supplies.

U.S. Defense Secretary Lloyd Austin took his comments further, saying that while the U.S. wants to see Ukraine remain a sovereign, democratic country, it also wants "to see Russia weakened to the point where it can't do things like invade Ukraine."

Austin's comments about weakening Russia appeared to represent a shift in broader U.S. strategic goals. Previously, the U.S. position had been that the goal of American military aid was to help Ukraine win and to defend Ukraine's NATO neighbors against Russian threats.

Russian Foreign Minister Sergei Lavrov said weapons supplied by Western countries "will be a legitimate target," adding that Russian forces had already targeted weapons warehouses in western Ukraine.

"Everyone is reciting incantations that in no case can we allow World War III," Lavrov said in a wide-ranging interview on Russian television. He accused Ukrainian leaders of provoking Russia by asking NATO to become involved in the conflict.

By providing weapons, NATO forces are "pouring oil on the fire," he said, according to a transcript on the Russian Foreign Ministry's website.

Regarding the possibility of a nuclear confrontation, Lavrov said: "I would not want to see these risks artificially inflated now, when the risks are rather significant."

"The danger is serious," he said. "It is real. It should not be underestimated."

When Russia invaded Ukraine on Feb. 24, its apparent goal was the lightning capture of Kyiv, the capital. But the Ukrainians, with the help of Western weapons, thwarted the push and forced President Vladimir Putin's troops to retreat.

Moscow now says its goal is to take the Donbas, the mostly Russian-speaking industrial region in eastern Ukraine. While both sides say the campaign in the east is underway, Russia has yet to mount an all-out ground offensive and has not achieved any major breakthroughs.

On Monday, Russia focused its firepower elsewhere, with missiles and warplanes striking far behind the front lines in an effort to thwart Ukrainian efforts to marshal supplies for the fight.

Five railroad stations in central and western Ukraine were hit, and one worker was killed, said Oleksandr Kamyshin, head of Ukraine's state railway. The bombardment included a missile attack near Lviv, the western city close to the Polish border that has been swelled by Ukrainians fleeing the fighting elsewhere around the country.

Ukrainian authorities said at least five people were killed by Russian strikes in the central Vynnytsia region.

Russia also destroyed an oil refinery in Kremenchuk, in central Ukraine, along with fuel depots there, Russian Defence Ministry spokesman Maj. Gen. Igor Konashenkov said. In all, Russian warplanes destroyed 56 Ukrainian targets overnight, he said.

Philip Breedlove, a retired U.S. general who was NATO's top commander from 2013 to 2016, said the latest strikes against fuel depots are part of a strategy to deplete key Ukrainian war resources. The strikes against rail targets, on the other hand, are a newer tactic, he said.

"I think they're doing it for the legitimate reason of trying to interdict the flow of supplies to the front," he said. "The illegitimate reason is they know people are trying to leave the country, and this is just another intimidation, terrorist tactic to make them not have faith and confidence in traveling on the rails."

Phillips P. O'Brien, professor of strategic studies at the University of St. Andrews in Scotland, said the war is, for now, settling into a campaign of incremental battlefield losses and gains.

"The two sides are sort of every day weakening each other," he said. "So it's a question of what can you bring in that's new" and "what can you destroy on the other side."

In Transnistria, a breakaway region of Moldova that sits along the Ukrainian border, several explosions believed caused by rocket-propelled grenades hit the territory's Ministry of State Security. There was no immediate claim of responsibility or reports of injuries. Transnistria is a strip of land with about 470,000 people and about 1,500 Russian troops based there.

Moldova's Foreign Ministry said "the aim of today's incident is to create pretexts for straining the security situation in the Transnistrian region." The U.S. warned previously that Russia may launch "false-flag" attacks against its own side to create a pretext for invading other nations.

Last week, Rustam Minnekayev, a Russian military commander, said the Kremlin wants full control of southern Ukraine, which he said would open the way to Transnistria.

An estimated 2,000 Ukrainian troops holed up in a steel plant in the strategic southern port city of Mariupol are tying down Russian forces and apparently keeping them from being added to the offensive elsewhere in the Donbas. Over the weekend, Russian forces launched new airstrikes on the Azovstal plant to try to dislodge the holdouts.

Some 1,000 civilians were also said to be taking shelter at the steelworks, and the Russian military pledged to open a humanitarian corridor Monday for them to leave.

The Russian offer was met with skepticism by Ukraine. Deputy Prime Minister Iryna Vereshchuk said on the Telegram messaging app that Ukraine does not consider the route safe and added that Russia had breached agreements on similar evacuation routes before. She called on the United Nations to oversee an evacuation.

The city council and mayor of Mariupol said a new mass grave has been identified about 10 kilometers (6 miles) north of the city. Mayor Vadym Boychenko said authorities were trying to estimate the number of victims. It was at least the third new mass grave discovered in Russian-controlled areas near Mariupol in the last week.

Mariupol has been gutted by bombardment and fierce street fighting over the past two months. In addition to freeing up Russian troops, the capture of the city would deprive Ukraine of a vital port and allow Moscow to establish a land corridor to the Crimean Peninsula, which it seized from Ukraine in 2014.

In his nightly video address, Zelenskyy said his country's goal is to maintain resistance and "make the occupiers' stay in our land even more intolerable," while Russia drains its resources.

A top Ukrainian official cast doubt on the prospect of further talks between the two countries. Recent sessions in Istanbul ended without resolution earlier this month.

Ukrainian Foreign Minister Dmytro Kuleba told The Associated Press in an interview that any negotiations other than talks between Zelenskyy and Putin would bring little resolution.

Britain said it believes 15,000 Russian troops have been killed in Ukraine since Moscow began its invasion. Defence Secretary Ben Wallace said 25% of the Russian combat units sent to Ukraine "have been rendered not combat effective."

Ukrainian officials have said about 2,500 to 3,000 Ukrainian troops had been killed as of mid-April.

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Associated Press journalists Yuras Karmanau and Jon Gambrell in Lviv, Ukraine, and AP staff around the world contributed.

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