Yes, damn Teutons. I could not declare war right away being a vassal, and once I got independent all "good" OPMs were already annexed. As you can see in my latest update I was looking to annex Pskov but I failed. Mazovia were allied to noone but was annexed by Poland about the same time as Pskov fell. (Interestingly, Mazovia then was released a couple years down the road and conquered almost all of Poland

*oops, spolier*)
At this time Munster was really the only OPM not guaranteed by any nation too mighty for me to handle. But as owning Munster eventually will draw the attention of England/Great Britain, I'm not seeing it as a permanent solution. Hopefully though, it will keep Gotland from getting annexed... for a while...