 Complete the following phrase:  In foreign policy, tsar Alexander I 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. After the massive defeat of the Russian and Austrian armies by Napoleon at the Battle of Austerlitz in 1805, Russian official propaganda blamed the Austrians and stressed the moral superiority of tsar Alexander I. He switched sides and formed an alliance with Napoleon by the Treaty of Tilsit 1807 and joined Napoleons Continental System of economic boycotts against Britain. He and Napoleon could never agree, especially about Poland, and the alliance collapsed by 1810. The tsars greatest triumph came in 1812 as 