Houses damaged by shelling in Ganja, Azerbaijan’s second-largest city, on Tuesday. Hundreds of fighters from Syrian militias allied with Turkey have joined the fighting between Azerbaijan and Armenia over the disputed enclave of Nagorno-Karabakh, and hundreds more are preparing to go, according to two Syrians involved in the effort. Turkey quickly declared its support for Muslim-majority Azerbaijan, whose people speak a Turkic language, in the escalating conflict between two former Soviet republics near the border with Russia—an area in which Moscow has historically been the dominant influence. On…