China and Russia are ramping up joint military drills. What’s their end goal?

Editor’s Note: Sign up for CNN’s Meanwhile in China newsletterwhich explores what you need to know about the country’s rise and how it impacts the world.

As Russia’s military last week launched globe-spanning drills widely seen as a show of strength directed at the United States, President Vladimir Putin made clear which country he sees as standing by Moscow’s side.

In an opening video address, Putin said 15 “friendly” nations would observe what Moscow claimed were some 90,000 troops and more than 500 ships and aircraft mobilized for the largest such exercises in 30 years.

But only China would take part alongside Russia, according to Putin.

“We are paying special attention to strengthening cooperation with our friendly countries. This is especially important today amid rising geopolitical tension around the world,” the Russian leader said.

Dubbed “Ocean-2024,” the seven days of drills that ended Monday are the latest in a recent slew of military exercises and joint patrols between Russia and China that come on the heels of vows from Putin and Chinese leader Xi Jinping to tighten military cooperation, even as the Kremlin wages its war against Ukraine.

China sent several warships and 15 aircraft to waters off Russia’s Far East coast for Ocean-2024, according to the Russian military. In addition, Chinese and Russian forces this month touted deepened strategic coordination during joint naval drills in waters near Japan and held their fifth joint maritime patrol in the northern Pacific.

It follows a raft of joint exercises over the summer, including near Alaska – where US and Canadian forces intercepted Russian and Chinese bombers together for the first time – and in the South China Sea, a vital