The Trump administration is blocking foreign governments, companies and individuals from accessing Anthropic's most advanced AI models.Why it matters: The move marks an escalation in Washington's effort to treat cutting-edge AI systems as national security assets.Anthropic now finds itself on a Pentagon blacklist deeming it too dangerous for the government's own use, and in a Commerce Department licensing regime deeming it too dangerous for foreign use. Driving the news: Commerce Secretary Howar...