The document also called attention to the fact that, although the Soviet authorities had declared their readiness to open peace negotiations with the Ukrainian Central Rada, neither the Ukrainian Government, "which is now directed by Germany," nor the Berlin Government itself, had given any answer to the Russian offer. "Owing to such circumstances," the message declared, "the Soviet Government considers itself compelled to mobilize all necessary forces in order to secure the freedom and independence of the Russian Republic, which is now menaced beyond the limits established by the Brest-Litovsk treaty." The document concluded by reiterating the complete readiness of the Russian people to fulfill the conditions of the Brest-Litovsk pact, and by demanding the German Government should formulate the new demands, "in the name of which it directs Ukrainian, Finnish, and German troops against the Russian Soviet Government." GERMAN PROMISES In response to this protest, Berlin, on May 13, advised the Soviet Government through the Russian Ambassador in Berlin, that Germany would stop the invasion of Russian territory, and that it would observe the Brest-Litovsk treaty and restore the rights of Russians residing in Germany. In spite of this assurance, however, the advance of the German Army in Great Russia did not cease. According to a Moscow dispatch, dated May 25, the Germans occupied the district town of Valuyki, in the Government of Voronezh, which is Great Russian territory, and made further advances. The occupation was preceded by a battle which lasted four days. The Teutons also continued their operations in the Don region, where a battle occurred near Bataisk, and in the Caucasus. They mined the Strait of Kerch, or Yenikal, known to the ancients as the Cymmerian Bosporus, which is the only passage from the Black Sea into the Sea of Azov. German airships appeared over Novorossysk, on the Black Sea coast of the Caucasus, and their submarines entered its port. This was done apparently to intimidate the Transcaucasian Government, which refused to cede Novorossysk to Turkey. About the same time Bolshevist detachments crossed the Caspian, attacked the Turks and recaptured the port of Baku. Another battle was won by the Russians over the Turco-German troops in the Kars district of Transcaucasia on May 24. The enemy retreated along the Ardahan road, massacring the population as they went. Early in June the Germans made a further advance in the south, namely, in the Roslav region and in the district of Rylsk, Government of Kursk. They advanced from the Rostov Railway toward Voronezh and captured Roventki. They also made an attempt to cut the Tsaratsyk Railway near the Kumyigar River. On June 10 the Germans started a new movement eastward along a front sixty miles wide, between Valyiki, captured previously, and Zhukovo. BLACK SEA FLEET