Knocking out another countries satellites is what would be done in a first strike nuclear attack according to modern military theorists.
China has tested space to space satellite weapons.
Russia has now tested space to space satellite weapons.
The US has not tested any space to space military assets and doesn't have this functionality as far as what is currently known. (The rumor mill also currently says the US has no such functionality and requires ground take off).
The reason this is important is that any response to a direct satellite attack would potentially take greater than 30 minutes using ground based weapons. (Again rumor mill).
China has tested space to space satellite weapons.
Russia has now tested space to space satellite weapons.
The US has not tested any space to space military assets and doesn't have this functionality as far as what is currently known. (The rumor mill also currently says the US has no such functionality and requires ground take off).
The reason this is important is that any response to a direct satellite attack would potentially take greater than 30 minutes using ground based weapons. (Again rumor mill).