Trying to keep technology from China is a qualitatively different problem from other technology sanctions. Russia, for example, has half the GDP of France. Denying a technology to Russia is effective because the relative price to Russia to work around technology restrictions is much higher. It costs them, measurably, visibly, in resources not applied to other pressing needs.<p>In the case of China, an import restriction amounts to an endorsement that replicating that technology is a higher priority for a country that, in general, is entering the first tier of technological powers. Picking fights with benefits that won't evaporate in a short time would be wise.