BEIJING, April 11 (Reuters) - China has decided to take

measures against two U.S. enterprises for arms sales to Taiwan,

the foreign ministry said on Thursday.

The measures against General Atomics Aeronautical Systems

and General Dynamics Land Systems, a unit of General Dynamics ( GD )

, which take effect on Thursday, include freezing their

properties in China and banning their senior executives from

entering the country, the ministry said.