On 4 Oct 2022, Vorobiov supported, in the Federation Council, the legislation to annex the Donetsk, Luhansk, Kherson and Zaporizhzhia regions of Ukraine.
As Member of the Federation Council, he participated in the ratification of the government decisions on the ‘Treaty of Friendship, Cooperation and Mutual Assistance between the Russian Federation and the “Donetsk People’s Republic”’ and the ‘Treaty of Friendship, Cooperation and Mutual Assistance between the Russian Federation and the “Luhansk People’s Republic”’.
Member and Deputy Speaker of the Federation Council of the Russian Federation, where he coordinates the work of the Federation Council Committee on Defence and Security, gives it instructions and controls the execution of those instructions. On 1 Mar 2014 Vorobiov publicly supported in the Federation Council the deployment of Russian forces in Ukraine. He subsequently voted in favour of the related decree.