Ukrainian President Volodymyr Zelenskyy said that Kyiv is moving to step up pressure on Moscow with new operations targeting Russia, following a week of Russian attacks that knocked out power to Ukrainian cities as freezing temperatures set in.

“Some of the operations have already been felt by the Russians. Some are still underway,” Zelenskyy said in his nightly address Saturday. “ I also approved new ones.”

Zelenskyy said Ukraine’s actions include deep strikes and special measures aimed at weakening Russia’s capacity to continue the war. “We are actively defending ourselves, and every Russian loss brings the end of the war closer,” he said.

He declined to provide details, saying it was “too early” to speak publicly about certain operations, but stressed that Ukraine’s security services and special forces are operating effectively.

As part of Kyiv’s efforts to reduce Russia’s offensive capabilities, Ukrainian forces attacked the Zhutovskaya oil depot in Russia’s Volgograd region overnight Saturday, the General Staff said in a post on social media.

Zelenskyy’s comments come after a week of escalating Russian strikes on Ukraine’s energy infrastructure, which left the regions of Zaporizhzhia and Dnipropetrovsk without electricity and heating as temperatures plunged well below zero.

In the capital, renewed attacks killed at least four people and injured 25 others. The city’s mayor urged residents who could leave to do so, as roughly half of Kyiv’s apartment buildings were left without power or heat.

Russia also launched a nuclear-capable Oreshnik ballistic missile at Ukraine’s Lviv region on Thursday, striking near the EU and NATO border as part of a massive barrage.