yeah ..NO. Not even the US with there Anti Russian agenda go as far as making such a ridiculous statement. Russia is fighting the rebels AND ISIS, mainly ISIS but they definitely are going after the rebels too many of which aren't much better than ISIS. Taking out high level officials is good for press releases and PR, it does very little in the actual war as even the US have stated ISIS work with many people trained to replace anyone so that no person is essential. Palmyra is ISIS, this is where current Russian strikes are centered it seems.
That's a good PR but even if it was true, wiping out commanders and financial officials deals more blows than picking off replaceable minions.