Kim Jong-un Inspects Russian Military

North Korea’s leader, Kim Jong-un, peeked his head into the cockpit of a fighter jet at a factory in the Russian Far East on Friday as he pressed ahead on a multiday tour of Russia that is enticing him at each stop with off-limits military technology.

Although Russia’s president, Vladimir V. Putin, hasn’t promised Mr. Kim any of the weaponry and has vowed to abide by U.N. sanctions banning their transfer, the tour carried an implicit threat — an example of what analysts say is a growing danger posed by Mr. Putin’s increasingly warm relationship with authoritarian leaders who can…