In 1907 Tiedemann left China to assist the diplomatic office of the Governor-General of Priamur in Khabarovsk. In 1908 he was back in China, serving as the Russian consul in British Hong Kong. In 1910 he sent Saint Petersburg scathing and detailed reports of the effect of the Portuguese Revolution in Macau, especially lamenting the anticlerical radicalism of certain elements in the Macanese garrison. On 14 November 1911, Tiedemann received Portuguese permission to visit Macau; an ancestor of his had moved to Macau in 1772 and died there. In 1911 he was made consul at Yingkou (Newchwang). In 1914 he moved to the Russian concession in Tientsin to act as consul and in 1915 he was promoted to consul general. In 1917 the February Revolution removed the tsar and then the October Revolution instituted a soviet republic. In 1920 diplomatic relations between China and Russia—in the midst of the Russian Civil War—were severed, and Tiedemann was without a job. From 1921 through 1934 he was on the municipal council of the Third Special District (the former Russian concession) in Tientsin. He worked to help White Russians, fleeing the Soviets, pass through. In 1925, his wife died.