True, however there are other countries that are considered allies of US at the extent that new technology is ok to be worked on (more specifically HPC). https

True, however there are other countries that are considered allies of US at the extent that new technology is ok to be worked on (more specifically HPC). https://fas.org/sgp/crs/natsec/RL31175.pdf https://fas.org/sgp/crs/natsec/RL31175.pdf