France, April 9 -- Since March, Ukrainian strikes have reached deeper into Russian territory, damaging refineries as well as major terminals that are central to Russia's oil exports.

After a campaign targeting sites on both the Baltic and the Black Sea, Ukraine's defence ministry says it has hit more than a dozen oil-related sites in the past month.

Ukraine has also expanded its list of targets beyond energy, identifying sectors such as metallurgy, fertilisers and microchips as linked to Russia's war industry.

The defence ministry has said it considers oil sites to be military assets. The campaign also comes in response to repeated Russian strikes on Ukraine's energy infrastructure.

Earlier this week, Kyiv proposed an energy truce. "I...