MOSCOW (Reuters) -Russia’s Foreign Ministry said on Thursday that if the United States decided to supply Kyiv with longer-range missiles, it would cross a “red line” and become “a party to the conflict”. In a briefing, Foreign Ministry spokeswoman Maria Zakharova added that Russia “reserves the right to defend its territory”. Washington has openly supplied Ukraine with advanced GMLRS rockets, fired from HIMARS launchers, that can hit targets up to 80 km (50 miles) away. “If Washington decides to supply longer-range missiles to Kyiv, then it will be crossing a red line, and will become a direct…