The front line with Russia has moved east. It makes sense for American forces to follow.
http://www.rosbalt.ru/russia/2018/05/30/1707068.html
http://www.kasparov.ru/material.php?id=5B0E4D75F303D
https://www.gazeta.ru/business/2018/05/29/11774113.shtml?updated
https://ru.krymr.com/a/29259756.html
https://ru.krymr.com/a/29259313.html
https://newtimes.ru/articles/detail/165621