 Complete the following phrase:  In foreign policy, he changed Russias position relative to France four times between 1804 and 1812 among neutrality, opposition, and alliance. In 1805 he joined Britain in the War of the Third Coalition against Napoleon, but after suffering massive defeats at the battles of Austerlitz and Friedland, he switched sides and formed an alliance with Napoleon by the Treaty of Tilsit 1807 and joined Napoleons Continental System. He fought 