Two Ukrainian early-warning radar systems ceased data sharing with Russia overnight after a post-Soviet agreement between the two countries was cancelled, Ukraine's Space Agency said on Thursday, according to Reuters. Quoting Moscow defence ministry officials, Russian media said Moscow had put into service its own facility in Armavir in the southern Krasnodar region to protect its southern flank, after the loss of data from the Ukrainian-based radars. Russia cancelled a 1992 agreement on sharing radar information last year, saying the systems were outdated and that it would be "unthinkable" to have such installations in a country aspiring to join NATO.