Who stopped mongol armies from invading japan

'Kamikaze' defeated the 2nd Mongol invasion.
The weather was also to blame, the mongols forced the chinese to build ships for them to go to Japan. unfortunately for the mongols, the Chinese made them riverboats. After the entire fleet was wiped out trying to get to japan, the mongols never tried again. 
Hope this helped :)

The answer is forindependence.