Russia and Japan have accused each other of military buildups as their foreign and defense ministers met in Tokyo for talks that failed to make progress on decades-long island disputes.

Russian Foreign Minister Sergey Lavrov said at a joint news conference Thursday that Russia was concerned about Japan’s plan to build two land-based Aegis Ashore missile defense systems, while his Japanese counterpart, Taro Kono, accused Russia of a military buildup on Russian-controlled islands claimed by both countries.

Lavrov brushed off Japan’s criticism, saying his country is only operating in its own territory.

Japan's Defence Minister Takeshi Iwaya, second right, shakes hands with Russia's Defence Minister Sergei Shoigu, left, while Japan's Foreign Minister Taro Kono, right, and Russia's Foreign Minister Sergei Lavrov, second left, look on after their 2+2 joint press conference at the Iikura Guest House in Tokyo, Thursday, May 30, 2019. (Kazuhiro Nogi/Pool Photo via AP)
Japan’s Defence Minister Takeshi Iwaya, second right, shakes hands with Russia’s Defence Minister Sergei Shoigu, left, while Japan’s Foreign Minister Taro Kono, right, and Russia’s Foreign Minister Sergei Lavrov, second left, look on after their 2+2 joint press conference at the Iikura Guest House in Tokyo, Thursday, May 30, 2019. (Kazuhiro Nogi/Pool Photo via AP)

The meetings also included Japanese Defense Minister Takeshi Iwaya and his Russian counterpart, Sergei Shoigu.

The island dispute has prevented the two countries from signing a peace treaty formally ending their World War II hostilities.

Japanese Foreign Minister Taro Kono, second from right, and Defense Minister Takeshi Iwaya, right, pose with Russian Foreign Minister Sergei Lavrov, second from left, and Defense Minister Sergei Shoigu for a photo prior to their meeting at the Iikura guest house in Tokyo Thursday, May 30, 2019. They hold meetings amid lack of progress on settling island disputes. (Franck Robichon/Pool Photo via AP)
Japanese Foreign Minister Taro Kono, second from right, and Defense Minister Takeshi Iwaya, right, pose with Russian Foreign Minister Sergei Lavrov, second from left, and Defense Minister Sergei Shoigu for a photo prior to their meeting at the Iikura guest house in Tokyo Thursday, May 30, 2019. They hold meetings amid lack of progress on settling island disputes. (Franck Robichon/Pool Photo via AP)
Japanese Foreign Minister Taro Kono, second from right, with Defense Minister Takeshi Iwaya, right, shows the way to Russian Foreign Minister Sergei Lavrov, second from left, and Defense Minister Sergei Shoigu prior to their meeting at the Iikura guest house in Tokyo Thursday, May 30, 2019. They hold meetings amid lack of progress on settling island disputes. (Franck Robichon/Pool Photo via AP)
Japanese Foreign Minister Taro Kono, second from right, with Defense Minister Takeshi Iwaya, right, shows the way to Russian Foreign Minister Sergei Lavrov, second from left, and Defense Minister Sergei Shoigu prior to their meeting at the Iikura guest house in Tokyo Thursday, May 30, 2019. They hold meetings amid lack of progress on settling island disputes. (Franck Robichon/Pool Photo via AP)