Answer
Gustavus Adolphus was involved in border conflicts with Russia and Denmark–Norway. He was determined to expand Sweden's empire in the Baltic region, and he launched a series of wars against these countries. The conflict with Russia began in 1610, when Gustavus Adolphus invaded Russia in an attempt to seize control of the city of Novgorod. The war ended in 1617, with Sweden gaining control of some Russian territory.