A new namespae called "vms" has now been added and there are two available operations: list running VMs on a host or killing a specific VM. To kill a VM, you will need to specify the kill type and VM's world id.
soft - Will give the VMX process a chance to shutdown cleanly (like kill or kill -SIGTERM)
hard - Will shutdown the process immediately (like kill -9 or kill -SIGKILL)
force - Should be used as a last resort attempt to kill the VM
The final resort, is to reboot the host if none of the above work.
Here is an example of various kill types: