Ukraine's foreign legion may be new, but the idea isn't

Foreign soldiers who volunteered to fight for Ukraine participate in training exercises. Geovien So/NurPhoto via Getty Images

After Russia launched its large-scale invasion of Ukraine in February 2022, many countries quickly responded by imposing sanctions on Russia and by sending weapons to help Ukraine defend itself.

But so far, the U.S. and its NATO allies have said they will not send troops.