Under the terms of the agreement and the secret protocol thereto, Sweden provided a mercenary corps, paid for by Russia, in exchange for the Korela Fortress and the surrounding county.

In 1609–1610, the Swedish auxiliary corps under the command of Jacob De la Gardie participated in battles against the supporters of False Dmitry II and the Polish interventionists.

According to William Pokhlebkin, the so-called "three-year war" of 1614–1617 was caused by the "mistake of Russian diplomacy under Vasily Shuisky" – "an uncritical choice of an ally in difficult times from among the eternal and traditional opponents of Russia".

Having decided to use the difficult situation of the Moscow government and at the same time to tie the forces of the Polish–Lithuanian Commonwealth, the king at the beginning of 1604 offered a large army to help Boris Godunov.

At the end of 1606, when the south of the country was gripped by a peasant uprising, and later, in May 1608, when the units of False Dmitry II approached Moscow, Charles was thinking about an open attack on the bordering Russian lands.

By the end of November, they agreed to send a Swedish auxiliary corps to Russia of 5 thousand people and to pay large salaries to the mercenaries by the Moscow government.

The news of the upcoming arrival of the traditional enemy, the Swedes, caused discontent among the inhabitants of the border cities, one by one they went over to the side of False Dmitry II: first Pskov, then Korela and Oreshek.

[6] The Shuisky government, however, did nothing to actually transfer the land, looking through the fingers at the disobedience of the townspeople, and even rewarding them for this: [At the beginning of 1610] Pushkin and Bezobrazov brought money to the archers of the Korel garrison to distribute the royal salary for the past year and a letter from the tsar.