On 1 March 2014 Klishas publicly supported, in the Federation Council, the deployment of Russian forces in Ukraine. In public statements Klishas sought to justify a Russian military intervention in Ukraine by claiming that “the Ukrainian President supports the appeal of the Crimean authorities to the President of the Russian Federation on landing an all-encompassing assistance in defence of the citizens of Crimea”.
On 4 October 2022, Klishas supported, in the Federation Council, the legislation to annex the Donetsk, Luhansk, Kherson and Zaporizhzhia regions of Ukraine.
On 22 February 2022, Klishas supported, in the Federation Council, the ratification of the government decisions of 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”.