спостереження за обстановкою на кордоні
border (security) forces /troops
border
border break (cart.)
border command
border control
border crossing arrangement
border crossing point (BCP) / station
border disputes
border management
border security
state border
trans-border cooperation
trans-border threat
US Border Patrol
violation of the state border
border and offshore submersible sentry
cetane number in border line
clandestine border crossing
border flight clearance
cross-border incursion
cross-border raid
border patrol drone
border fence
boundary monitoring and analysis
communications monitoring
crisis situation monitoring
fallout monitoring station
monitoring arms implementation and compliance activity
monitoring equipment
monitoring immune response
monitoring party
OSCE Special Monitoring Mission (SMM) to Ukraine