Ivan the Terrible gave a marriage proposal to Queen Elisabeth Tudor.
What he wanted out of it -
a son to rule Russia and a place of exile if he is overthrown by his own people.
What he got out of the marriage proposal - building of a English embassy in Russia and a small ten-foot boat which was warehoused until after his death.
(Peter the Great took both. The embassy, he used to house his mistresses and start thinking of looking to the west. As for small boat, it became the first ship in the Russian navy.)
Yet there are no timelines where she and Ivan create a hybrid empire. Here is your challenge! Marry Ivan to Elizabeth and keep the empire intact.