The Danish combat battalion with 700-800 soldiers that are part of the NATO equipment usually has 30 days to get ready to pull out.
The battalion will now gather in Slagelse and prepare to be able to pull out within one to five days.
The deployment of combat aircraft on Bornholm has previously taken place when there has been increased Russian aviation activity in the vicinity of Danish airspace.
The Danish Chief of Defense, General Flemming Lentfer, emphasizes that there is currently no heightened threat to Denmark or Bornholm.
- We are strengthening our military capabilities to be able to react faster if the situation requires it, he says to the news agency Ritzau.
Frederiksen in a meeting with Stoltenberg
On Tuesday, Danish Prime Minister Mette Frederiksen (S) had a meeting with NATO Secretary General Jens Stoltenberg.
In a post on Facebook, Frederiksen writes: "Serious situation in and around Ukraine and therefore also a serious conversation this morning with NATO Secretary General Jens Stoltenberg".
- It is unusual and an expression of a serious crisis situation that a Danish combat battalion gathers and is ready for battle, says political science professor Mikkel Vedby Rasmussen at the University of Copenhagen.
He sees it as a response to requests from NATO, which wants to pressure Russia into a negotiated solution.
- It is important for NATO to signal that there are no other solutions than a negotiated solution.