The Danish military said it had deployed several measures to respond to overnight discoveries at the bases, but declined to provide further details about the nature of the reaction.
According to the latest decision, civil UAVs will be banned from flying in Danish airspace from September 29 to October 3.
We are in a difficult security situation and we must ensure the best working conditions for the armed forces and police as they take security responsibility during the European Union (EU) summit, Danish Defense Minister Troels Lund Poulsen said.
Foreign UAVs breaking into the airspace early last week forced Denmark to close several airports, including Copenhagen Airport, which was suspended for nearly four hours on September 22.
Denmark called the incidents part of a hybrid attack.
Although the country has not yet confirmed which side is responsible, Prime Minister Mette Frederiksen hinted that it could be Moscow, calling Russia the leading EU security threat.
The Kremlin denied involvement.
Denmark will host EU leaders on October 1, the following day being the summit of the 47-member European Political Community, established to connect the EU with European countries to support Ukraine.
A German anti-aircraft cruise ship docked at Copenhagen on September 28 to assist in air monitoring during high-level events.
