Ukrainian attacks on Russian energy infrastructure and supply routes are worsening fuel shortages across Russia, with the crisis now spreading from Russian-controlled Crimea to Omsk in southwestern Siberia, Reuters reported.

Authorities in Omsk have imposed fuel purchase limits “to avoid artificially creating panic buying at gas stations and speculation”, restricting gasoline and diesel sales and banning fuel can refills.

Russian strikes overnight wounded six people across Sumy, Zaporizhzhia and Kharkiv, while Kyiv briefly issued an air raid alert.

The attacks came a day after a Ukrainian strike on a missile electronics plant in Russia’s Voronezh region, which local authorities said killed five people and injured dozens.

Ukrainian president Volodymyr Zelenskyy has warned that Russia is preparing another major attack even as Ukraine seeks Western support for a peace deal and closer integration with the EU.

Ukraine’s UN envoy, Andrii Melnyk, said Kyiv is still willing to negotiate directly with Russia and has already made a major concession by offering a full and unconditional ceasefire along the current front lines.

However, he warned that “our patience is not endless”.

“If the security council would further choose a wait-and-see approach, I cannot exclude that Ukraine may recalibrate and modify its offer. Ceasefire along the de facto ‌front line is already a great compromise.”

His comments come as Ukraine feels increasingly confident militarily after striking Russian oil facilities, supply lines, and military infrastructure, putting pressure on Russia, experts say.

Officials in Russia-occupied Crimea suspended civilian gasoline sales Sunday as Ukraine ramped up attacks on fuel supplies on the Black Sea peninsula.

The Russia-appointed Crimean governor Sergei Aksyonov said that overnight Ukrainian strikes killed four people and wounded 28. He later wrote on social media that local gas stations would halt all sales to non-state companies and individuals for an undefined period.

“Fuel will be sold only to government agencies that ensure the functioning and security of the Republic of Crimea,” Aksyonov said. “I ask everyone to remain calm and to only trust official sources of information.”

Ukrainian forces have repeatedly targeted fuel supplies to Crimea in recent weeks, triggering the worst energy crisis in the region since it was illegally annexed by Russia in 2014.

Polish prime minister Donald Tusk has warned that a growing political dispute between Poland and Ukraine is a strategic error that risks damaging both countries, as he attempts to ease renewed tensions over events dating back to the Second World War.

The row escalated after Polish president Karol Nawrocki on Friday revoked Ukraine president Volodymyr Zelensky’s highest Polish state honour. In response, three former Ukrainian presidents and several senior officials returned the awards they had previously received from Poland.

Nawrocki withdrew the Order of the White Eagle after Zelensky drew criticism in Poland for renaming a Ukrainian military unit in honour of the Ukrainian Insurgent Army, a nationalist force responsible for massacres of Poles during the Second World War.

“Wading into a conflict between politicians in Poland and Ukraine ‌is a strategic mistake that will harm both sides: business-wise, geopolitically, and reputationally. And in politics, as we know, a mistake is worse than a crime,” Tusk wrote in a post on X.

The pro-European leader returned to power in 2023 after heading a coalition that defeated the nationalist Law and Justice party, with which Nawrocki is politically aligned.

In an interview published on X, Zelensky stressed that Ukraine and Poland could only remain “partners and friends”, warning that political tensions could lead to a “very dangerous escalation”.

“Our service members choose a ‌heroic name for their unit themselves, and as president and supreme commander-in-chief, I must support them,” he said.“Without Ukraine, no one will be able to defend Poland. It is simply impossible.”

Russian forces have entered the strategic eastern Ukrainian city of Kostyantynivka and are attempting to encircle it, according to a BBC report citing Ukrainian soldiers and military officials.

The city, regarded as a gateway to the wider Donbas region, has become a focal point of fighting as Moscow seeks to secure full control of eastern Ukraine.

Ukrainian troops told the BBC that Russian soldiers have established positions within parts of the city, making it increasingly difficult to remove them in urban combat.

While Russia has claimed rapid advances and the encirclement of Ukrainian units, Kyiv has rejected those assertions.

Brig Gen Oleksandr Bakulin, commander of Ukraine’s 19th Corps, said “the situation remains under control” and “the enemy has no success”, though he acknowledged that 130 Russian troops were operating inside the city.

Ukrainian soldiers told the outlet that supply routes were under sustained pressure and described growing logistical challenges.

As we earlier reported, Ukraine’s military said it had hit a plant producing electronics for missiles in Russia’s Voronezh region on Monday.

It is the latest blow on Russia’s military-industrial complex inflicted by Ukraine’s growing long-range strikes.

We can now bring you images of the strike:

The Kremlin has said it is beginning intense work to try and minimise the consequences of fuel disruption in Russian-held Crimea.

The peninsula is suffering a fuel crisis following Ukrainian drone attacks targeting energy infrastructure,

Kremlin spokesman Dmitry Peskov also said that there was a coordination mechanism between the government and oil companies when it came to fuel prices nationwide and that all necessary measures were being taken.