Tens of thousands of Syrians who were running for their lives piled up near the border crossing with Turkey here on Monday. They were fleeing a crushing wave of Russian airstrikes and government ground forces advancing toward the frontier in a developing rout of insurgent forces north of Aleppo, Syria ’s largest city. The intense and, critics say, indiscriminate Russian air attacks have shattered the latest round of peace talks, forced the regional and global players to reassess their strategies and calculations and left Syrian insurgents shocked that the United States and other countries that […]