They do still use Metric. In Russia:
Westbound: 1200M to 7800M in 600M steps, thence 8600M (FL252), 9600M (FL315), 10600M (FL348), 11600M (FL381).
Eastbound: 900M to 8100M in 600M steps, thence 9100M (FL299), 10100M (FL331), 11100M (FL364), 12100M (FL397)
Westbound: 600M to 6000M in 600M steps, thence 7200M (FL236), 8400M (FL276), 9600M (FL315), 10800M (FL354), 12000M (FL394).
Eastbound: 900M to 5700M in 600M steps, thence 6600M (FL216), 7800M (FL256), 9000M (FL295), 10200M (FL335), 11400M (FL374)
So on a flight from Europe through Russia then China, you have to do a couple of flight level adjustments as you reach their respective FIR boundaries.