Russia Ukraine war, page-182338

christianity had existed for nearly a thousand years prior to that
originally russia was part of the Greek Orthodox Church under the Byzantine Patriarch but later under the bishop of Kyiv

the russian orthodox church did not exist until the 1400's- RUSSIA itself never existed until the the 1500's - - prior to that it was simply part of the Greek Orthodox Church so the bit about St Vladimir founding the "russian orthodox church " is quite bogus