Denmark has informed its NATO allies that drone incursions that shut two of its airports are linked to unspecified "state actors", Latvia's foreign minister says, adding that the West must invest in anti-drone capabilities.

Denmark's foreign ministry did not immediately reply to a request for comment. Its defence minister earlier said the overnight drone sorties were hybrid attacks aimed at spreading fear.

He did not identify the perpetrators.

The incident, the second in two days in Denmark alone, is part of what some European officials see as a pattern of Russian disruption that has exposed the vulnerability of European airspace at a time of high tensions between Moscow and NATO.

Russia's embassy in Copenhagen on Thursday rejected as "absurd" speculation about Moscow's involvement in

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