The Néel ordering in heavily underdoped YBa 2Cu 3O 6+ x has remarkably different impact on the electron transport within CuO 2 planes and between them. While the in-plane resistivity and magnetoresistance (MR) are smooth through the Néel temperature TN, the out-of-plane transport demonstrate striking anomalies, e.g. the MR increases by two orders of magnitude at TN. These observations give evidence that the spin fluctuations play the key role in the out-of-plane transport and that the charge confinement within the CuO 2 planes is related to the spin degrees of freedom. We discuss whether the picture of charged stripes can account for these features.