<p>HUAWEI founder Ren Zhengfei struck a defiant tonetoday against American attempts to block his company’s global ambitions, saying the US “underestimates” the telecom giant’s strength.</p> <p>Ren spoke to Chinese state media days after President Donald Trump issued orders aimed at thwarting Huawei’s business in the United States, the latest salvo in a months-long effort to stop the company’s charge to the top of the leaderboard in next-generation 5G technology.</p>