KYIV, Ukraine — Ukrainian forces hit an oil terminal, a pipeline, two parked jet fighters and two ships in a series of strikes on Russian soil, officials said Monday.

The attacks are part of an ongoing campaign to disrupt the Russian war effort and sow fear behind the front line, where outnumbered Ukrainian troops are straining to hold back Russia’s bigger army after almost four years of war.

The strikes also seek to undermine President Vladimir Putin’s attempt to portray Russia as negotiating from a position of military strength in U.S.-led peace efforts, which have yet to make a breakthrough on key points.

The killing of a top Russian general by a car bomb in Moscow on Monday, with investigators suspecting Ukraine was behind it, could be another instance of Kyiv picking surprise targets.

Ukrainian forces struck the Tamanneftegaz oil terminal, an ammunition depot and a launch site for attack drones inside Russian territory and Russian-held Ukrainian territory, Ukraine’s General Staff said in a statement Monday.

A pipeline, two docks and two ships were damaged in the southern Krasnodar region, and a large blaze broke out, the statement said, without specifying what kind of weapons were used in the attack.

It added that a Ukrainian-made missile also hit a temporary base for Russia’s 92nd River Boat Brigade in Olenivka, in the occupied Crimean Peninsula.

A separate strike targeted an ammunition depot in a Russian-controlled portion of the Donetsk region, aiming to slow the Russian advance there, the General Staff said. A Russian launch site for attack drones was also hit.

Ukrainian partisans set fire to two Russian jet fighters in an operation on Sunday evening at a base near Lipetsk, a city in western Russia, according to Ukraine’s military intelligence.

Russia’s Ministry of Defense said only that its forces shot down 41 Ukrainian drones overnight, three of them over the Krasnodar region.

Meanwhile, Russian forces kept up their targeting of Ukraine’s energy sector, aiming to deprive civilians of heat and running water during the frigid winter. Russia has tried to knock out power in Ukraine throughout the war, in a tactic that Ukraine refers to as “weaponizing winter.”

Energy infrastructure across five regions were attacked during the night, Ukraine’s Ministry of Energy said.

Russia struck Ukraine with 86 drones of different types overnight, Ukraine’s air force said. Ukrainian forces stopped 58 of them, it said.

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