North Korea's military is getting more than weapons testing can offer by letting Russia fire its missiles at Ukraine

• North Korea is gathering invaluable data by letting Russia use its missiles and ammo in Ukraine.
• A South Korean official warned Ukraine has become a "test site" for North Korea's missiles.
• Both Putin and Kim stand to gain considerably from closer Russian-North Korean relations.

The front lines in Ukraine, bloody and bruised from one two years of brutal full-scale war, are proving opportunistic for North Korea.