What was the background of the Battle of poltava?

The Battle of poltava took place on June 27th 1709, a large-scale war between Tsarist Russia and Sweden. At that time, Tsar Peter the Great wanted to recapture the Baltic territory controlled by Sweden, and fought fiercely with Carl XII of Sweden in poltava, Ukraine. The background of the Battle of poltava is a microcosm of the constant conflict between Sweden, a powerful European country, in northern Europe, which has seriously affected Russian national interests. As early as 1700, Carl XII of Sweden had defeated Denmark and Russia, but he did not completely stop the war. In the next seven years, Russia has been trying to govern. Impressed by the specialization of the Swedish army, Peter the Great began to carry out professional training for the army, including training infantry to use muskets. After the Russian victory in Vonia, the Battle of poltava broke out. Carl XII of Sweden can't stand Russia's arrogance and is ready to send troops to suppress Russia again. Different from the last war, Carl XII made a wrong decision this time. This time he wanted to attack Moscow, the heart of Russia, so he led an army into Russia at 1709. The background of the poltava War reflected the change of the pattern of European powers at that time, and the sphere of influence of big powers was re-divided. After the Battle of Karl XII in poltava, Sweden suffered a crushing defeat. Since then, Sweden has been crossed off the list of strong countries in Europe, and it can no longer rule the Baltic Sea, while Denmark and Finland have begun to move towards independence. Although the conflict between Russia and Sweden did not stop after the Battle of poltava, as the symbolic Battle of poltava, the decline of Sweden began.