With Poland being right next to Kaliningrad Oblast, where the Iskander-M are stationed, that's convenient (but means the site is already vulnerable to first strike from very close by).
no, but they already got mobile systems on their ships in the region, so how, specifically, does an 'Ashore' variant in Romania make things worse for Russia's strategic forces ?
Of course, the real head-ache is ballistic missiles from Iran
really, so you need land based BMDs in Romania to deal with a possible DPRK threat, even with that big US presence in RoK, Japan and everywhere else ?
In more distant future maybe also to consider
again, the US/West/NATO already have a huge global military presence and enough counters in virtually every part of the world to deal with China, what is the need for sticking one in Romania (right on Russia's borders)
hey, lets face it, nothing will ever save anyone from one of those, why even waste time and money trying ?
jokes aside, let's not kid ourselves with this NATO move in Romania, it is squarely directed at Russian ballistic missiles, but given their known capability, in my limited knowledge, I'd say it's largely an optics play letting Putin know just how close they can get with their defensive systems, which implies they could also get so close with offensive wmds.
unless this Aegis ashore thing is actually strategically a much bigger headache than their already established capabilities.