In the comments, HDarrow asked a good question a few days ago:
Which countries have we improved our relations with in the past year?Which countries have we worsened our relations with in the past year?
Peter Feaver answers it a bit here.
My short list of countries where we've seen the most movement:
Improved Relations:
1. Russia
2. Pakistan
Worse Relations:
1. Israel
2. China
3. Japan
4. Poland
5. Czech Republic
(AP Photo)