Putin talks about Russia and Ukraine being a family. Why is it so stiff?

Quite simply, the Russian-Ukrainian family's argument is based on the fact that Russia's predecessor, the Grand Duchy of Moscow, inherited the Russian in Kiev, and both of them originated from Russia's long-term rule over the Eastern Slavs and Ukraine in history.

On the other hand, the Grand Duchy of Moscow can be said to be the heir of Kiev, Russia, but Kiev is now the capital of Ukraine. It is true that Ukraine was ruled by Russia for a relatively long time in history, but Russia only ruled most of Ukraine, while parts of western Ukraine were ruled by Poland, Lithuania, Austria and Austria-Hungary for a long time. This historical difference and the resulting cultural differences make it difficult for all Ukrainians to accept the statement that the Ukrainian family is the only one. Historically, Russia's rule over this part of Ukraine was not so good. Cossacks in eastern Ukraine enjoyed autonomy when they joined Russia, which was later cancelled. During the reign of Peter the Great, Russia stationed a large number of troops in Ukraine to put out any signs of rebellion and arrest all those who dared to demand the restoration of Cossack autonomy. Not to mention one of the models of the black Soviet Union: the Great Famine in Ukraine. With these historical problems, the Ukrainian family is a joke: you say that we are a family, and your culture, language and writing are different. There are many broken things in history. What makes you say that we are family?