In Sweden, the training of the armed forces "Aurora-23" will start on Monday. The training takes place from April 17 to May 11, reports the Swedish Armed Forces.
The army, navy, air force and national guard of the country together with international partners will take part in the exercises.
"The goal of the exercises is to strengthen the potential to repel an armed attack on Sweden," the Swedish Armed Forces said.
Exercises are conducted in the air, on land and at sea in many parts of the country.
Aurora 23 is said to be "the largest national exercise of its kind in more than 25 years." 14 countries and about 26,000 women and men participate.
"Participating countries, in addition to Sweden, are the USA, Great Britain, Finland, Poland, Norway, Estonia, Latvia, Lithuania, Ukraine, Denmark, Austria, Germany and France," the message reads.