A vengeful Russia is sending streams of migrants to Finland's borders to punish it for working with the US, officials say

• Finland has accused Russia of sending undocumented migrants across the border. 
• It says 300 migrants have arrived at the border with the help of Russian officials. 
• Experts say Russia is retaliating to Finland's decision to join NATO. 

A vengeful Russia is attempting to stoke a migrant crisis in Finland by sending hundreds of asylum across the border on bicycles and scooters, authorities in Helsinki say.

On Friday, Finnish authorities said they were closing four of the eight crossings on its border with Russia after a surge in the number of migrants attempting to enter the country.