Last time we spoke about the climax of the battle of Changkufeng. A 7–10 August clash near Changkufeng and Hill 52 saw a brutal, multi-front Soviet push against Japanese positions in the Changkufeng–Hill 52 complex and adjacent areas. The Korea Army and Imperial forces rapidly reinforced with artillery, long-range 15 cm and other pieces, to relieve pressure. By 7–8 August, Soviet assault waves, supported by tanks and aircraft, intensified but Japanese defenses, including engineers, machine-gun fire, and concentrated artillery, prevented a decisive breakthrough at key positions like Noguchi Hill and the Changkufeng spine. By 9–10 August, continued Japanese counterfire, improved artillery neutralization, and renewed defenses kept Hill 52 and Changkufeng in Japanese control, though at heavy cost. The frontline exhaustion and looming strategic concerns prompted calls for intensified replacements and potential diplomatic considerations. It seemed like the battle was coming to an end.

#184 The Lake Khasan Truce

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The casualties were atrocious for both sides, yet they continued to mobilize more forces to the conflict area. While the Russians appeared uninterested in all-out war, they were not rushing to settle the crisis through diplomacy and, at the front, were launching "reckless" counterattacks at inconvenient locations, presumably to occupy positions useful for bargaining. The local Soviet military, having ceded the hills at the outset, must also have been anxious about its prestige. The Kwantung Army's potential threat to the flank undoubtedly made the Russians nervous. Although the leading echelon of the 104th Division did not reach Hunchun until the evening of 13 August, Japanese intelligence heard that the Red Army Headquarters staff at Khabarovsk had detected movements of Kwantung Army elements around 10 August and had been compelled to take countermeasures: they reinforced positions along the eastern and northern Manchurian frontiers, concentrated the air force, ordered move-up preparations by ground forces in the Blagoveshchensk district, and commandeered most of the motor vehicles in the Amur Province. By shifting its main strength to the eastern front, the Kwantung Army exerted, as intended, a silent pressure. The covert objective was to restrain and divert the Russians and to assist Japanese diplomacy, not to provoke war. Nevertheless, an American correspondent who visited the Changkufeng area in mid-August privately reported that the Kwantung Army was massing large numbers of troops near the border and expected further trouble.

Toward its weak neighbor in Korea the Kwantung Army rendered every support. Apart from its major demonstration in eastern Manchuria, the Kwantung Army promptly sent whatever reinforcements of artillery, engineers, and other units that Seoul had desired. Being also intimately involved in anti-Soviet military preparations, the Kwantung Army understandably wanted the latest and most authentic information on Russian Army theory and practice. The Changkufeng Incident furnished such a firsthand opportunity, and the professional observers sent from Hsinking were well received at the front. Military classmate ties contributed to the working relationships between the armies. As one division officer put it, the teams from the Kwantung Army came as "friends," not only to study the battlefield by their respective branches of service but also to assist the front-line forces; "the Kwantung Army was increasingly helpful to us in settling the incident."

Foreign Minister Ugaki felt that the pressure of troop movements in Manchuria played a major part in the Russians' eventual decision to conclude a cease-fire. From Inada's viewpoint, it had been a "fine and useful demonstration against the Soviet Union." Pinned at Changkufeng, the Russians did not or could not choose to react elsewhere, too. Army General Staff officers believed that clear and consistent operational guidance furnished by Tokyo produced good results, although the fighting had been very hard for the front-line Japanese troops because of the insistence on exclusive defense, the curbs on interference by the Kwantung Army, and the prohibition on the use of aircraft. It had been close, however. Only by conscious efforts at restraint had the small war at Changkufeng been kept from spilling over into neighboring areas.

Escalation of combat in early August had caused the Japanese government to try to break the diplomatic impasse while localizing the conflict. On 2 August Premier Konoe assured the Emperor that he intended to leave matters for diplomacy and to suspend military operations as soon as possible, an approach with which the government concurred. The Changkufeng dispute had been accorded priority, preceding overall settlements and the creation of joint commissions to redefine the borders. On the 3rd, after coordinating with the military, the Ministry of Foreign Affairs advised Shigemitsu that the front-line situation had become "extremely critical" and that a quick suspension of fighting action should be proposed. Soviet and Japanese troops should be pulled back to the setup as of 30 July.

In the midst of the Changkufeng Incident, the USSR intensified harassing tactics against the last Japanese consulates located within the Soviet Union. Forty-eight hour ultimatums to quit the country were delivered to the consuls at Khabarovsk and Blagoveshchensk on 3 and 4 August, respectively. Although the Japanese government warned that it might retaliate, the Russians were unyielding. The foreign ambassadors, Mamoru Shigemitsu and Maxim Litvinov met on August 4th, whereupon Shigemitsu argued, the best procedure would be to suspend military operations on both sides and to restore the status quo. Litvinov in a long manner explained the stance of the USSR as Shigemitsu put it "the Soviet side had a disposition to cease fighting, provided that conditions were satisfactory." The Russians were stalling at the very time the Red Army was bending every effort to retake Changkufeng. Coordination between the Army, Navy, and Foreign Ministers produced cease-fire conditions which were rushed to the Japanese ambassador on 6 August. Two alternate lines were proposed, to which both armies would pull back. After the creation of a buffer zone, discussions could begin concerning delineation of boundaries in the region of the incident. The Hunchun pact could be the basis for deliberations, demarcation to be effected by joint investigations on the spot in consultation with documents in the possession of Manchukuo and the USSR; the Japanese would serve only as observers. Shigemitsu conferred once more with Litvinov for three and a half hours on 7 August, but no progress was made. Litvinov insisted that a clash could be averted only if Japanese forces pulled However Litvinov's positive reaction to the idea of a demarcation commission was seen as a good sign.

On August the 10th, both sides seemed to have reached a similar conclusion that a cease-fire needed to rapidly be implemented. At 11pm that night Litvinov called the embassy, asking for Shigemitus to see him as fast as possible. Shigemitsu arrived around midnight whereupon Litvinov showed him a draft of a final accord: 1. Japanese and Soviet forces shall cease all military activities on 11 August at noon local time. Instructions to that effect are to be issued immediately by the governments of the USSR and Japan.

2. Japanese as well as Soviet troops shall remain on those lines which they occupied at midnight local time on 10 August.

3. For redemarcation of the portion of frontier in dispute, there shall be created a mixed commission of two representatives from the USSR and two representatives from the Japanese-Manchurian side, with an umpire selected by agreement of both parties from among citizens of a third state.

4. The commission for redemarcation shall work on the basis of a...