Washington, Feb 14 US Secretary of State Marco Rubio on Saturday said Washington has an “obligation to communicate” with China, describing sustained dialogue between the world’s two largest economies as a strategic necessity even amid deep structural tensions. Speaking at the Munich Security Conference, Rubio said: “The two largest economies in the world, two of the big powers on the planet, we have an obligation to communicate with them and talk.” He added, “I mean, it would be geopolitical malpractice to not be in conversations with China.” His remarks came in response to a question about an expected summit “in…