Finnish military chiefs had also invited NATO and EU observers for the Arctic Lock exercise.

"International exercises are important, but in this situation it is even more important to keep the coronavirus under control," Defence Minister Antti Kaikkonen said.

Finland's Foreign and Security Policy Committee decided to replace it with a national exercise involving 15,000 troops.

Arctic Lock was to be the latest in a series of historically large drills in the region that reflect increasing tension between many Western states and Russia.

Three years ago, Sweden's Aurora-17 training exercise became the country's largest for over two decades.

A follow-up this year which would have involved 25,000 troops was also cancelled due to the pandemic.

Meanwhile the US's Defender 2020 was designed to be the largest deployment of US troops in Europe since the end of the Cold War.

Although the Covid-19 outbreak caused it to be scaled down, the training went ahead and prompted Russia to launch its own combat jet drills over the Baltic in response.

Finland will look into organising a large-scale international exercise later in the decade, the defence ministry said.

Finland and neighbouring Sweden are not NATO members but in recent years have increased their cooperation with the alliance, under the status of "enhanced opportunity partners".