Isn't Putin a J himself?
No. But Ukraine’s current prez is.
Although Js and Ukrainians had even worse conflicts than Js and Russians, there was always a broad understanding between their two ethnic nationalisms. Check out the writings of Ze'ev Zhabotinsky, especially if you read Russian.
That said, Js are divided on this. The Js in Russia are one of the biggest driving forced in anti-Ukrainian sentiment. The main Russian anti-Ukrainian propagandist, Vladimir Solovyev, is a J.
Ideally, the Js should go to Isr and leave the Slavs alone, while Russian and Ukrainian nationalists should cooperate to stop the persecution of Russian nationalism in Russia, stop the flood of migrants into Russian cities, and reduce the influence of minority ethnic elites in Russia.