Alleged Israeli airstrikes that hit central Syria reportedly targeted an Iran-linked precision ballistic missile project.
Beijing and Moscow have called for sanctions to be eased on the North to jumpstart diplomatic talks and improve the humanitarian situation.
Iran is trying to develop hypersonic missiles which pose a greater threat to Israel than ballistic missiles.
Russian Defence Minister Sergei Shoigu's visit was the first by Moscow's top defense official since the 1991 break-up of the Soviet Union
The addition of the Abu Mahdi would give Iran a cruise missile with a claimed range of 1,000km, Iranian state media claimed on Tuesday.
This would be North Korea's latest missile launch since it fired two ballistic missiles on Wednesday.
There are “dozens of missile bunkers” dug into this canyon, the Alma Research and Education Center says.
Putin stressed the importance of Russia's "triad" of nuclear forces that can be launched from land, sea or air.
Iran has expanded its missile program, particularly its ballistic missiles, despite opposition from the US and expressions of concern by European countries.
Qiao is in China and has not been arrested, prosecutors said. He faces charges including sanctions evasion, bank fraud and money laundering.
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