AWS Inter-Region VPC connectivity Issue

I wanted to establish inter-region VPC connectivity from US-East to US-West VPC.

Brief about VPC, Subnet CIDR's:

US-East

VPC CIDR: 10.0.0.0/16
NAT Subnet CIDR: 10.0.0.0/24
Data Subnet CIDR: 10.0.1.0/24

US-West

VPC CIDR: 10.1.0.0/16
NAT Subnet CIDR: 10.1.2.0/24
Data Subnet CIDR: 10.1.1.0/24

And I did the following configuration: US-East:

1. Launched a new OpenVPN instance and configured strongswan for accepting the VPN connections.
2. Configured ipsec.conf, ipsec.secrets with the VPN tunnel IP’s and VPN pre shared keys

US-West:

1. Created a new customer gateway with the public IP where OpenVPN is running
2. Created virtual private gateway and new VPN with our static routes (192.168.XX.XX)
3. In HANA security group, opened the 8012 port from anywhere (just for testing)
4. In routing tables propagated the route for dataservers subnet and added one more CIDR 10.0.0.0/16 (US East)
5. In NAT routing table added the inteet gateway in the routes

But when I trying to ping the private IP of NAT from East to West, not able to ping. Public IP's are reaching.

Any other basic configuration am I missing ?

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