DUBAI, Sept 22 (Reuters) - Here are some factors that may affect Middle East stock markets on Tuesday. Reuters has not verified the press reports and does not vouch of their accuracy.INTERNATIONAL/REGIONAL* U.S., Arab partners launch first strikes in Syria US-SY* GLOBAL MARKETS-Asia relieved as China flash PMI beats low expectations MKTS/GLOB* Brent climbs above $97 after upbeat China PMI O/R* MID