Both the Chechians and the Syrians [If they actually arrive] are or will be under Russian command; in the Ukraine to specifically fight the Ukrainians. Both will be or are secularists and neither are part of any Jihadist group thus the possibility of them getting hold of Western weapons and
''using them around the world'' are slim
.
If you're so concerned about volunteers getting hold of certain weapons what about the Western volunteers pouring into the Ukraine? Some might have questionable backgrounds and far right ideologies.
I was under the impression that MLRS are intended to hit targets in the enemy's operational depth at ranges beyond that of arty and are intended for their saturation effect [during the period when MLRS guided rounds were not yet available].