Tell pink to provide you an outlet lane. Since he’s your only border, he probably has pressure from 2 or 3 other players. If he’s smart he’ll take your offer since you have to go that way anyways. Diplomatic presentation is essential. I’ve found polite honesty to be the most effective for that particular situation. He can either deal with you attacking him, or he can willingly cede you a path so that he is no longer a target. It’s nothing personal, afterall
Once you’ve landed in his core, you can either uphold your commitment and attack someone else (green maybe, since you’ll eventually have range to head that way anyway), or if the opportunity presents itself you might be able to manage a fast takeover of his (yellow) empire and you got “free” scanning to do it.
At game start, if youre a lone wolf, it’s better to be on the perimeter with 1 neighbor and less stars and opportunities than it is to be in the center with 3 neighbor’s and more stars and opportunities than fleet strength to maintain it.
That’s my thought anyway.