Relations between Poland and Muscovite Russia have been tense, as the increasingly desperate Grand Duchy of Lithuania involved the Kingdom of Poland into its war with Muscovy around 16th century. As Polish historian Andrzej Nowak wrote, while there were occasional contacts between Poles and Russians before that, it was the Polish union with Lithuania which brought pro-Western Catholic Poland and Orthodox Russia into a real, constant relation with both states engaged in "the contest for the political, strategic and civilizational preponderance in Central and Eastern Europe". While there were occasional attempts to create an alliance between the new Polish–Lithuanian state and the Muscovy (including several attempts to elect the Muscovite tsars to the Polish throne and create the Polish–Lithuanian–Muscovite Commonwealth), they all failed. Instead, several wars occurred. Notably, during the Polish–Muscovite War (1605–18), Poland exploited Moscow's politically weakened state caused by civil war and Polish forces took Moscow – an event that would become one of the many defining moments of the future Polish–Russian relations. Muscovy, now transforming into the Russian Empire, retaliated by taking advantage of the weakening Commonwealth, taking over disputed territories and moving its borders westwards in the aftermath of the Russo-Polish War (1654–67) and later participated in the destruction of the Commonwealth during the Swedish Deluge. By the beginning of the 18th century, with the deterioration of the Commonwealth political system (Golden Liberty) into anarchy, Russians were able to intervene in internal Polish affairs at will, politically and militarily, see (Silent Sejm, War of the Polish Succession). Around the mid-18th century, the influence of ambassadors and envoys from Russia to Poland, could be compared to those of colonial viceroys and the Commonwealth was seen by Russians as a form of protectorate.