From The Russo-Ukraine War: The Return of History, by Serhii Plokhy (W. W. Norton, 2023), Kindle pp. 118-119:
On March 18, 2014, Vladimir Putin delivered one of the most consequential speeches of his career. Addressing a joint session of the lower and upper houses of the Russian parliament—the deputies of the State Duma and the members of the Federation Council, joined by regional leaders and representatives of Kremlin-controlled civic organizations—Putin asked the deputies to approve a law annexing the Ukrainian Crimea and the city of Sevastopol to the Russian Federation. Two days after the referendum, Putin was ending the Crimea’s short-lived independence by annexing the peninsula—the first annexation of a sovereign nation’s territory in Europe by a foreign state since World War II.
In his speech, Putin declared that the Crimean self-defense units had taken the initiative to bring about reunification, and the people of the Crimea had decided their fate, preventing Sevastopol from being turned into a NATO military base. He took advantage of the opportunity to remind NATO and the West of all the injustices allegedly committed against international law and Russia, from the bombing of Serbia to the recognition of Kosovo’s independence, as putative justification for Russia’s actions in the Crimea, and denounced the “color revolutions” as coups engineered by the West.
Putin made an unprecedented appeal to Russian nationalism. This was a marked departure from his earlier statements and pronouncements, in which his main addressee and point of reference was the multiethnic Russian political nation embodied by the citizens of the Russian Federation, referred to as rossiiane rather than ethnic russkie. Now he claimed that Russia and the Russians were the greatest divided nation in the world. After the fall of the USSR, said Putin, when “Crimea ended up as part of a different country . . . Russia realized that it was not simply robbed, it was plundered.” “All these years,” he declared, “citizens and many public figures have come back to this issue, saying that Crimea is historically Russian land and Sevastopol is a Russian city.”
There were also elements of the speech that appealed to Russo-Ukrainian unity, despite Putin’s attack on Ukraine and annexation of part of its territory. “Orthodoxy,” claimed Putin, “predetermined the overall basis of the culture, civilization, and human values that unite the peoples of Russia, Ukraine, and Belarus.” He even declared that Russia was taking the Crimea on behalf of both Russians and Ukrainians to prevent its loss to a third party. “Crimea is our common historical legacy and a very important factor in regional stability,” Putin went on. “And this strategic territory should be part of a strong and stable sovereignty, which today can only be Russian. Otherwise, dear friends (I am addressing both Ukraine and Russia), you and we—Russians and Ukrainians—could lose Crimea completely, and that could happen in the near historical perspective.”
Putin made a hybrid argument for the annexation: appealing to Russian history, territory, and identity, he invoked the legacy of empire to claim the Crimea under the banner of Russian ethnic nationalism, while also maintaining that Russians and Ukrainians were Slavic brethren. The latter was meant to exploit the sense of Russo-Ukrainian unity to which many citizens of Russia and Ukraine subscribed. Putin assured Ukrainians that Crimea was a unique case—a part of Ukraine historically, culturally, and ethnically belonging to Russia. The rest of Ukraine was safe. “Do not believe those who want you to fear Russia, shouting that other regions will follow Crimea,” declared Putin. “We do not want to divide Ukraine; we do not need that.” In fact, the division of Ukraine was exactly what Putin undertook in the weeks and months following his Crimean speech.
In conclusion, Putin asked the Russian parliamentarians to ratify the treaty and create two new constituent entities within the Russian Federation, one for the Crimea, another for the city of Sevastopol. The parliament complied, and on March 21 Putin signed the law integrating the Crimea and the city of Sevastopol into the Russian Federation. The annexation of the Crimea was now a fait accompli, carried out in accordance with the Russian constitution but in blatant violation of international law and treaties signed by Russia, including the Budapest Memorandum of 1994 and the Russo-Ukrainian Friendship Agreement of 1997.