Pro-Kremlin disinformation narrative about the history of Ukraine and Ukrainian statehood.
The history of Ukraine dates back to the times of the Kyivan Rus’ in the IX-XIII centuries. As a nation-state, Ukraine was formed during the XVI-XIX centuries when it was divided by major European states: the Polish-Lithuanian Commonwealth (Rzeczpospolita) and the Austro-Hungarian and Russian empires. However, in the middle of the XVII century, parts of Ukraine's territories received independence from Poland and created an independent Cossacks Hetmanate. Later, it signed a military and political cooperation deal with Moscow, which was then used by Russian rulers to deprive Hetmanate of its sovereign rights.
In the early XX century, after the collapse of the Russian empire, the Ukrainian People’s Republic was proclaimed. In Western Ukraine, which at the time was part of the Austro-Hungarian empire, the Western Ukrainian National Republic was created. On 22 January 1919, the two states signed a Unification Act creating a unified state. Other territories wanted to join the new Ukrainian state, such as Northern Bukovyna and Crimea, and adopted appeals to the government of a unified Ukrainian People’s Republic.
For a historical perspective see here [in Ukrainian].