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A view shows smoke rising above the area following an alleged explosion in the village of Mayskoye in the Dzhankoi district, Crimea, on Aug. 16.STRINGER/Reuters

Moscow denounced sabotage and Ukraine hinted at responsibility for new explosions on Tuesday at a military base in Russian-annexed Crimea that is an important supply line for Russia’s invasion of Ukraine.

The blasts engulfed an ammunition depot at a military base in the north of the Crimean peninsula, disrupting trains and forcing the evacuation of 2,000 people from a nearby village, according to Russian officials and news agencies.

Plumes of smoke were later seen at a second Russian military base in central Crimea, Russia’s Kommersant newspaper said, while blasts hit another facility in the west last week.

The explosions raised the prospect of new dynamics in the six-month-old war if Ukraine now has capability to strike deeper into Russian territory or pro-Kyiv groups are having success with guerrilla-style attacks.

Russia has used Crimea, which it annexed from Ukraine in 2014, to reinforce its troops fighting in other parts of Ukraine with military hardware, a process Ukraine is keen to disrupt ahead of a potential counteroffensive in the south.

Crimea is the base of Russia’s Black Sea Fleet and also popular in the summer as a holiday resort.

In Tuesday’s blasts, an electricity substation also caught fire, according to footage on Russian state TV. Seven trains were delayed and rail traffic on part of the line in northern Crimea had been suspended, Russia’s RIA news agency said.

Ukraine has not officially confirmed or denied responsibility for explosions in Crimea, though its officials have openly cheered incidents in territory that, until last week, appeared safe in Moscow’s grip beyond range of attack.

Ukrainian presidential adviser Mykhailo Podolyak and chief of staff Andriy Yermak both exulted on social media at “demilitarization”: an apparent mocking reference to the word Russia uses to justify its invasion.

“Operation ‘demilitarization’ in the precise style of the Armed Forces of Ukraine will continue until the complete de-occupation of Ukraine’s territories,” Mr. Yermak wrote on Telegram.

Mr. Podolyak told Britain’s Guardian newspaper later that Ukraine’s strategy was to destroy Russian “logistics, supply lines and ammunition depots and other objects of military infrastructure. It’s creating a chaos within their own forces.

“I certainly agree with the Russian ministry for defence, which is predicting more incidents of this kind in the next two, three months,” Mr. Podolyak said, as quoted by the Guardian.

Russia’s defence ministry said the explosions at the ammunition depot were “a result of sabotage.”

With the war raging since Feb. 24, attention has also focused in recent days on shelling in the vicinity of the Zaporizhzhia nuclear reactor complex, Europe’s largest, in a Russian-occupied area of southeastern Ukraine.

Russian-installed officials there, quoted by Interfax news agency, said on Tuesday Ukrainian forces shelled the city of Enerhodar where the plant is located. They accused Ukraine of doing so to provoke Russia into returning fire.

Later on Tuesday, 20 Russian rockets and 10 artillery rounds hit the city of Nikopol on the Ukrainian government-controlled bank of the Dnipro river across from Enerhodar, the Ukrainian regional governor Valentyn Reznichenko wrote on Telegram. He said four people were wounded.

Reuters could not immediately verify either side’s accounts.

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