What territories has Russia claimed Ukraine has irrevocably lost during the ongoing conflict?

According to Russian representatives, Ukraine has irrevocably lost several significant territories during the ongoing conflict. These include Crimea, which was annexed earlier, as well as Donetsk, Luhansk, Kherson, and Zaporizhzhia regions. All of these territories have been formally annexed by Russia during the course of the conflict, despite international condemnation and Ukraine's continued claims to these lands. These territorial claims by Russia represent a major geopolitical shift in the region and a significant challenge for any future peace negotiations between the two countries.