Russia has formally warned Japan of possible countermeasures following the deployment of US Typhon missile systems on Japanese soil, Russian Foreign Ministry spokeswoman Maria Zakharova said on Tuesday, 1 September. The warning was delivered at a briefing on the sidelines of the Eastern Economic Forum in Vladivostok, marking a sharp diplomatic escalation between Moscow and Tokyo.

What Russia Said

'The Japanese Embassy was clearly informed that the deployment of this type of weaponry on Japanese territory, even under the pretext of military exercises, is absolutely unacceptable, as it poses a threat to Russia's security,' Zakharova said. She added that Moscow had warned of retaliatory measures to safeguard its national security interests.

The Russian Foreign Ministry had lodged a formal diplomatic protest with the Japanese Embassy on Monday over the planned military exercises — a day before Zakharova's public remarks.

The Typhon System and Its Capabilities

The Typhon missile system, deployed at Kanoya Air Base in Kagoshima Prefecture for the Valiant Shield exercises, is capable of carrying Tomahawk missiles with a range of up to 1,600 km, according to Japanese media reports from late June. It is the longest-range ground-based weapons system ever deployed in Japan.

The systems — including the High Mobility Artillery Rocket System (HIMARS) — are expected to remain in Japan through the Orient Shield and Valiant Shield joint exercises running between June and September. Once the drills conclude, both systems are set to be moved to a US military base in Japan for storage, according to reports citing sources familiar with the matter.

A Pattern of Contested Deployments

This is not the first time the Typhon system has triggered controversy on Japanese soil. It was first deployed in Japan in September of last year during large-scale joint exercises in Yamaguchi Prefecture, western Japan — a deployment that drew sharp criticism from local residents after the system remained in place far longer than authorities had initially indicated.

In May, reports emerged of plans to deploy the Typhon mid-range launcher and HIMARS to southwestern Japan, following strong local opposition to the earlier deployment. This recurring pattern of community pushback underscores the domestic political sensitivity surrounding US military hardware on Japanese territory.

Russia's Broader Demands

Zakharova also called on Japan to return to its traditional pacifist foreign policy, and reiterated that Russian sovereignty over the Southern Kuril Islands — a longstanding territorial dispute between the two countries — was 'beyond question.' The remarks signal that Moscow views the missile deployment not in isolation but as part of a broader shift in Japan's strategic posture under its revised defence guidelines.

What Comes Next

With diplomatic protests now formally lodged and Russia publicly threatening countermeasures, the episode is set to test the durability of Japan–US security cooperation against rising regional pressure. Tokyo has not publicly responded to Moscow's warning as of the time of this report. How Japan navigates the dual pressure — from a US alliance deepening its forward presence and from a Russia increasingly willing to escalate diplomatically — will be closely watched across the Indo-Pacific.