I'm sure it's no a surprise to anyone, but some (all?) corp. jet operators in Russia put enormous pressure on pilots (whether russian pilots or not) And it's not only when s* hits the fan, it's daily business practice to make things 'more profitable' at expense of anything.
Let's just say the pax on those jets shouldn't get too comfy next time they fly into questionable (what's minimums?) weather at 18th duty hour...