This move by the PLO is a clear act of aggression. It does not matter if it's warfare or lawfare it's still a hostile act. By destroying previous agreements between Israel and the PLO, the PLO has opened up the way for Israel to annex all disputed land.
U.S. to deliver 8 advanced F-16s to Egypt on July 30-31, U.S. embassy in Cairo says (Reuters)
from the article: Abbas: Palestinians to seek full UN membership