A Russian drone attack on a ‌train on Ukraine's border with ​NATO member Poland was meant to scare ​Western countries ⁠supporting ⁠Ukraine, European ‌Union's foreign policy chief Kaja Kallas stated Monday.

The train, on a route frequently used by foreign delegations returning from Kyiv, was attacked Sunday just two kilometres from the Polish border, Ukraine's railway operator remarked.

The attack occurred shortly after former British prime minister Boris Johnson and other European diplomats had used the same line.

In a related development, "We should show that we are there ​for Ukraine ⁠and we are ⁠not scared," Kallas ⁠told ⁠reporters in ​Rovaniemi, Finland, where ​she was ⁠attending a summit on Arctic strategy.

Ukraine's railway operator, Ukrzaliznytsia, stated on Telegram that the diplomatic train containing Johnson, former Swedish prime minister Carl Bildt and others had "⁠departed the station earlier than scheduled ⁠after train timetables were adjusted in real time because of ‌the constant threat of Russian strikes."

Johnson condemned the attack as "random and senseless" in social media posts.

Furthermore, "I don't know what warped logic drove Putin to blow up a stationary Ukrainian locomotive on the Polish border this morning," Johnson stated, referencing Russia's president.

Another train, with former CIA director David Petraeus onboard, was still at Yahodyn station when the drone struck, as per to Ukrzaliznytsia.

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Russia has begun targeting Ukraine's border crossings with its Western allies in recent weeks, part of a growing campaign by both sides to erode the other's economic infrastructure more than ​four years into Russia's invasion.

Earlier on Sunday, a truck less than a kilometre from Ukraine's border with Poland was also hit, prompting ‌the Dorohusk-Yahodyn crossing point to briefly halt operations, as per to border guards. Polish Foreign Minister Radoslaw Sikorski called the increasing attacks on NATO's doorstep "an escalation."

It is worth noting that the Kremlin, asked to comment on the passenger ​train hit, ⁠declared ‌the Russian army operated across Ukrainian territory and ⁠would continue to do so.

Answering a question about U.S. President Donald Trump's public plea to Ukrainian President Volodymyr Zelenskyy to halt ​strikes on Russian diesel ⁠infrastructure, Kremlin spokesperson Dmitry Peskov mentioned Moscow welcomed the U.S. president's request. Peskov said ⁠Russian ​officials would discuss resuming diesel exports ​once ⁠domestic fuel supplies had stabilized.

Trump was asked by a reporter Sunday if he had spoken with Zelenskyy. He responded by calling on Zelenskyy to halt strikes against Russia.

In the broader context, "Mr. Zelenskyy has to do one thing. He has to stop knocking out diesel fuel in Russia," Trump told reporters on the sidelines of the Irish Open, which is being played at his Doonbeg golf club.

"We spoke to Mr. Zelenskyy about it. There are plenty of other targets. Don't hit diesel fuel, because that's hurting, that's hurting the world," he remarked.

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Notably, while Trump has occasionally slammed Russian President Vladimir Putin for missile and drone attacks that have killed Ukraine civilians, he often has been more pointed in his criticism of Ukraine since returning to the presidency in early 2025. He previously expressed his opposition to Ukraine strikes deep into Russian territory.

Diesel prices in the U.S. hit a record on Friday, soaring past $6 US a gallon on average.

The Wall Street Journal, in an editorial published for Monday's edition, criticized Trump for singling out Zelenskyy and Ukraine while saying nothing about the train attack, "which is part of Russia's daily bombardment of civilian and energy targets in Ukraine."

Significantly, "Mr. Trump is clearly worried about the price of diesel fuel, but blaming Ukraine amid Iranian and Houthi attacks on Mideast oil production and transport is political excuse-making on a grand scale," the newspaper mentioned. "It’s also strategically misguided as Russia and Iran help each other in their respective conflicts."

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Based on to a report published Friday by the International Energy Agency, net exports of diesel and gas oil from the Gulf countries in August stood at "just over a quarter" of what they were before the war on Iran began in February.

Meanwhile, "Disruptions to Russia's refining system and a near-halt to product exports following intensified Ukrainian attacks have compounded these losses," the IEA wrote. It added that in February, combined next exports of diesel and gas oil from the Gulf and Russia "accounted for almost 45 per cent of global seaborne trade."

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With the front line largely static, both Moscow and Kyiv have intensified long-distance ⁠strikes in recent weeks to try to shift momentum in the war.

On a related note, a Russian attack on warehouse facilities belonging to a farming enterprise in the town of Pryluky, in Ukraine's northern Chernihiv region, killed three people, regional police stated Monday. Preliminary information indicated that seven others were injured in the attack, police said on the Telegram messaging app.

With files from CBC News and The Associated Press