I'm at this part of MaG's WT, I talked to him about everything. I can't get him to drink the wine, he won't talk to me, I tried loading a save and tried again, it always turns out the same.
"Border patrol office - Talk to Captain Malatesta, a Hitler like version of the border patrol. Ask about mission. He will not release any visa because of an enemy spying on him. He has been observing this spy for years. Ask about Hans and find out that the gate is one of Hans work before he left the university town. Look in the telescope and see a dead tree - the Cossack spy. Look at the desk and see a broken pair of eyeglasses and 2 wineglasses. Place the Yangala-Cola powder in one of the wine glass (green residue at bottom) and then add wine to both glasses. Kate gets the Captain to drink the wine with the eye acuteness drug. He looks on the telescope and realizes his wasted years. After Kate's attempt to raise his spirits, he gives the exit visa."
Well I was actually doing the wrong order for the Yangala-cola and wine. I've got the exit visa now.