North Korea's Kim gets a close look at Russian fighter jets as his tour narrows its focus to weapons

North Korean leader Kim Jong Un inspects Russia 's most advanced fighter jet as he tours an aircraft factory.

Video shows Kim looking at the cockpit of the Su-57 — Russia ’s most sophisticated fighter jet — while listening to its pilot.

Putin dismisses idea that North Korea asked North Korea to send troops to fight alongside Russian soldiers in Ukraine .

Experts say Kim will likely supply ammunition to Russia for its war efforts in Ukraine in exchange for advanced weapons or technology from Russia .

U.S. and South Korean officials step up their condemnation of recent moves by Russia and North Korea .

National security advisers warn Moscow and Pyongyang will “pay a clear price” if they go ahead with such deals, South Korea says.

South Korea has accused North Korea of providing ammunition, artillery shells and rockets to Russia .