MOSCOW —

       Russia’s defense chief on Tuesday signed a roadmap for closer military ties with China, pointing to increasingly frequent U.S. strategic bomber flights near both countries’ borders.

       During a video call, Defense Minister Sergei Shoigu and his Chinese counterpart, Wei Fenghe, “expressed a shared interest in stepping up strategic military exercises and joint patrols by Russia and China,” according to the Russian Defense Ministry.

       “China and Russia have been strategic partners for many years,” Shoigu said. “Today, in conditions of increasing geopolitical turbulence and growing conflict potential in various parts of the world, the development of our interaction is especially relevant.”

       Shoigu pointed to increasingly intensive flights by U.S. strategic bombers near Russian borders, saying there were 30 such missions over the past month alone.

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       “This month, during the U.S. Global Thunder strategic force exercise, 10 strategic bombers practiced the scenario of using nuclear weapons against Russia practically simultaneously from the western and eastern directions,” Shoigu said, adding that they came as close as 12 miles to the Russian border.

       He also noted a rise in the number of U.S. bomber flights over the Sea of Okhotsk where they practiced reaching their launch points for cruise missiles, which he said poses a threat to both Russia and China.

       “In such an environment, the Russian-Chinese coordination becomes a stabilizing factor in global affairs,” Shoigu said.

       Wei praised Russia for successfully countering what he described as U.S. pressure and military threats.

       Shoigu and Wei hailed a series of maneuvers that involved Russian and Chinese warplanes and naval ships, and signed a plan for military cooperation for 2021 to 2025.

       On Friday, two Russian Tu-95MS strategic bombers and two Chinese H-6K strategic bombers flew a joint patrol over the Sea of Japan and the East China Sea, prompting South Korea to scramble fighter jets, officials said.

       The bomber patrol followed joint naval maneuvers by Russian and Chinese warships and aircraft in the Sea of Japan last month.

       In August, Shoigu visited China to attend joint war games, which marked the first time that Russian troops had taken part in drills on Chinese territory.

       They were the latest in a series of war games in recent years intended to underline increasingly close military relations between Moscow and Beijing.

       Russian President Vladimir Putin and China’s leader, Xi Jinping, have developed strong personal ties to bolster a “strategic partnership” between the former communist rivals as they both faced tensions with the West.

       Russia has sought to expand ties with China as its relations with the U.S. and its allies sank to post-Cold War lows over Moscow’s 2014 annexation of Ukraine’s Crimea Peninsula, accusations of Russian hacking attacks, interference in elections and other disputes.

       Even though Russia and China in the past rejected the possibility of forging a military alliance, Putin said last year that such a prospect can’t be ruled out. He also has noted that Russia has been sharing highly sensitive military technologies with China that helped significantly bolster its defense capability.