Poland has increased the protection of key railway lines and crucial elements of infrastructure, according to RMF FM.
Polish law enforcement services have cracked a Russian spy network, a national radio station has reported.
RMF FM said on its website on Wednesday that the group was preparing sabotage operations which could affect railway lines critical for the transport of weapons and ammunition to Ukraine, including in the vicinity the Jasionka airport in south-eastern Poland, which is also used for such transports.
