TBILISI, Oct 18 (Reuters) - U.S. Defense Secretary Lloyd Austin said on Monday that Washington was closely watching China"s development of advanced weapons systems but declined to comment on a report that it had tested a nuclear-capable hypersonic missile. The Chinese foreign ministry said on Monday that China had tested a space vehicle in July, not a hypersonic missile, as reported by the Financial Times. read more Austin was speaking at a news conference during a visit to Georgia.