China tried to shoot laser beams that would blind American spy satellites

However, the Defense News site reports that it is not clear whether the attempt was successful

In recent days, China has fired powerful lasers at American spy satellites flying over its territory, in what experts see as at least proof of China's ability to blind spacecraft.
It is still unclear how many times the lasers were tested against American spaceships or whether the attempt was successful. However, the combination of China's efforts and the advanced ability of Russian satellites to jam signals from satellites illustrates the vulnerability of the American space network and the need for the American Air Force to develop advanced and classified space architectures and systems.

The Defense News website reports from experts that depending on their power, lasers can blind electro-optical satellites such as the giant Keyhole satellites or even interfere with radar satellites such as the Lacrosse. Blindness does not cause the satellite to be disabled because for that a lot of power is needed, and even then most of the laser power is wasted on penetrating the lower atmosphere and capturing the satellite moving quickly in space.

The hardware on the satellites cannot be changed once they are launched into space, but the software on them can be changed to disrupt these attacks.

The ability of the Russians to disrupt satellite systems has long been known. The US Air Force destroyed such systems that prevented the Americans from using GPS-guided missiles in Iraq in 2003. However, the administration has so far not responded to the Chinese efforts in this area as part of the Bush administration's efforts not to upset Beijing, which is a leading trade partner of the US and focuses its foreign policy on countries that burden it such as North Korea and Iran.

For the full information in Defense News