The map shows two systems - Romii and Romulus. Systems in Star Trek are separated by many light years. The only way that is feasible to cross the distance between these systems or to launch an attack against an outpost is for a ship to have a form of FTL drive.
As for the Valiant
incident, magnetic space storms are localized events. They can occur on or near a planet or in a region of space. They are not wormholes. These storms have been mentioned in TOS, DS9, and VOY. (See here: http://en.memory-alpha.org/wiki/Magnetic_storm;
I, also, did a search on Chrissie's transcript site - that's how I got the DS9 reference)
The word wormhole was introduced into the English language in 1957. (http://en.wikipedia.org/wiki/Wormhole