Okay, so this isn’t a real “invasion”. It’s a friendly joint military exercise called BALTOPS 2015, and it involves the militaries of the United States, Finland, Great Britain and yes, Sweden.
A bunch of examples of air support were utilized, including B-52s, which can be seen in the video. No, not these B-52s. The aircraft.
There were also amphibious landing vessels, Mark 62 mines and a whole host of other varied artillery and flotilla.
This is how the U.S. Navy explained the training:
BALTOPS is an annually recurring multinational exercise designed to enhance flexibility and interoperability, as well as demonstrate resolve of Allied and partner forces to defend the Baltic region.