Creating Multi-Hop VPN. 2 VPN Tunnels to different vpn concentrators.
E.g: one to France, one to USA. Both OpenVPN. Change the routing. 0.0.0.0/0 goes through the tunnel to USA. 0.0.0.0/1 and 128.0.0.0/1 go through the France tunnel. The USA tunnel must itself goes through the France tunnel so every bit from the computer goes to France from there to USA.
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This is very important for privacy because traffic can not be tracked going to and from the same single vpn concentrator.