I faced same issue.

My setup is: 
IPv4 [+] use this connection only for resources on its network 
IPv6 [-] use this connection only for resources on its network 

I get `REFUSED` when I try to run `dig google.com.` and I see following
at /var/log/syslog:

May 12 21:54:45 localhost NetworkManager[19137]: <info> Writing DNS information 
to /sbin/resolvconf
May 12 21:54:45 localhost dnsmasq[19070]: setting upstream servers from DBus
...
May 12 21:54:45 localhost dnsmasq[19070]: using nameserver 213.180.205.1#53 for 
domain yandex.net
May 12 21:54:45 localhost NetworkManager[19137]: <info> VPN plugin state 
changed: started (4)


When I change setup to:
IPv4 [+] use this connection only for resources on its network 
IPv6 [+] use this connection only for resources on its network 

I can resolve non-VPN domain names and non-specific nameserver is
mentioned at the /var/log/syslog too:

May 12 21:58:20 localhost dnsmasq[19070]: setting upstream servers from DBus
...
May 12 21:58:20 localhost dnsmasq[19070]: using nameserver 213.180.205.1#53 for 
domain yandex.net
May 12 21:58:20 localhost dnsmasq[19070]: using nameserver 192.168.42.1#53 
<---- that one :)
May 12 21:58:20 localhost dbus[840]: [system] Activating service 
name='org.freedesktop.nm_dispatcher' (using servicehelper)

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https://bugs.launchpad.net/bugs/1304437

Title:
  After connecting to OpenVPN server the default DNS is no longer
  available

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