As further proof, you post a link to the same text as the treaty, and a map matching what I posted.
What islands do you believe lie east and west of 193 degrees?
193 is not the dividing line, it is a crossing point on that angled line.
The western boundary of the treaty is defined as the midpoint between Krusenstern and Ratmanoff on the 65 degrees, thirty minutes north latitude. From this point is heads straight north.
Leaving the claimed islands Bennett, Henrietta, Jeannette, Wrangel and Herald on the Russian side of the border.
Then we go back to the same starting point and head southwest, between St. Lawrence and the southeast point of Cape Choukotski, then continue southwest to pass midway between the island of Attou and Copper island.
Since the border is east of Copper island, Copper island is in Russia.
None of these island were ever in the US. Can we stop this nonsense now?