Pompeo thinks that we’re still back in the cold war with the USSR, when the left didn’t control the USA and it’s allies.
No official job. Does it violate the Logan Act? No. If he went to Russia it would. The issue is negotiating with a nation that ‘has a dispute’ with the US. Ukraine no-Russia plenty. Would Biden go after him? Doubt he could.
Trump could and should while the show trial is going on.