https://www.reuters.com/article/us-usa-trade-china-huawei-analysis/tall-chip-tale-huaweis-backup-plans-leave-experts-unconvinced-idUSKCN1SN0YN >Chip experts are calling out Huawei for its claims that it could ensure a steady supply chain without U.S. help, saying the technology the Chinese telecoms network gear maker buys from American companies would be "hard to replace".