Russian intelligence is particularly interested in the
Norwegian defence sector, including what it contributes in
military support to Ukraine, and its oil and gas sector, given
that it is now Europe's biggest gas supplier, Roehjell said.
He said Norway's oil and gas technology was coveted by Moscow given it cannot access such technology due to international sanctions and now tries to get it by spying.
NATO-member Norway shares a border with Russia in the Arctic. It has stepped up security since the start of the Ukraine war, especially around its oil and gas installations. Russia on Friday said relations with Norway had been dealt "a serious blow" and the Nordic country was "increasingly confirming the status of a state hostile to Russia".
"These actions will not go unanswered on our part, we will implement a tough response," Foreign Ministry spokeswoman Maria Zakharova said in a statement, without giving specifics.
In October, Norway arrested a suspected Russian spy it described as an illegal agent - an intelligence operative without official government links who assumes a covert persona. Norway has also investigated a number of drone sightings around oil and gas infrastructure onshore and offshore in the wake of explosions last year on the Nord Stream pipelines. (Reporting by Gwladys Fouche Editing by Terje Solsvik, Peter Graff and Nick Macfie)