Yeah, like the promise to Russia that NATO would never expand eastwards? Remember that solemn promise by the US? The Americans tend to be somewhat forgetful about their legal obligations, and the Russians know this perfectly well.
Besides, what you propose isn't worth much, as Russia has Crimea already (mostly because the people of Crimea want to be in Russia).
Your desire to break the Russians from the Chinese is obvious. But next time make up a better lie.
Yes, I have such high expectation of YOUR becoming a geopolitical mover a shaker, that I would find it worth my time to lie to YOU, to break up some fantastic Russo Chinese alliance.