Either you have perhaps set a new record for land based range - perhaps through RF atmospheric ducting! as has happened between East Anglia and near continent - @Ryanteck - Note the RSSI & SNR values are right at the limit of what gets reported through the GW’s (as IIRC @LoRaTracker has commented prevbiously in other threads). Or more likely as has happened previously someone has brought a device registered to the EveryNet Russia service into the country - perhaps a logistics load through a local port?! 
I caught a node few days back right on the limits like that hitting our gateway. Dropped by the back end. Few months back I took a GPS LoRaWAN node on a flight from Manchester to corfu. Never got GPS lock… But some transmissions were hitting over 5 gateways simultaneously.haha