Comment by imalerba

Google Engineers have confirmed an issue with Virtual Private Cloud (VPC). There is an issue with:

    Network connectivity from newly created VMs to VMs in different regions
    VM to VM communication
    VM to VM communication over internal IPs

In the following locations:

    asia-east1 (active)
    europe-west4-b (active)
    us-central1 (active)

Edit: they marked europe-west4-b down again