 In May 1918, Romania could not continue the war and negotiated a peace treaty with Germany.In November 1918, Romania rejoined the war after the Austro-Hungarian and Russian empires had disintegrated.In 1918, at the end of World War I, the union of Romania with Bukovina was ratified in 1919 in the Treaty of Saint Germain, and some of the Allies recognized the union with Bessarabia in 1920 through the never ratified Treaty of Paris.