North Korea is showing off its military power in a less explosive way.
The country unveiled a series of missiles Friday in a military parade. Experts say they believe the weapons were land and submarine-launched ballistic missiles.
The annual parade celebrates the birth of North Korea's founder, Kim Il-sung.
But this year the holiday came as tensions run high between North Korea and another world power.
After that, North Korea threatened to hit the U.S. in a "merciless retaliatory strike."
U.S. officials admit the situation is tricky. Moving forces near the peninsula, even as a preemptive measure, could increase the risk of a large-scale conflict.
But South Korea's top diplomat said the U.S. would consult with Seoul before any serious decisions are made.