Now show an official Ukraine policy documents declaring targeting Russians based on Russian national or ethnic identity. A pattern of such activity without official policy documents would do to. Though for example the fact that mostly Russians are killed in the invading tanks doesn't qualify because it is just happens that the tanks are manned mostly by Russians and those Russians are killed not for being Russians, they are killed for driving invading tanks.

For the current genocide conducted by Russia in Ukraine Putin's editorial and speeches, including the speech declaring the war, declaring erasure of Ukrainian national and ethnic identity are such official policy documents.