Not a Trump fan here but I just thought of this and it kind of makes sense.

At the end of last year OPEC and a number of non-OPEC countries such as Mexico and Russia decided to cut oil production to help boost oil prices. This increase in production has allowed US shale oil to come back online which has dampened the price increase.

Trump wants to increase US oil production even more, which might put more oil on the market and decrease the price despite the OPEC/nOPEC deal. The OPEC and non-OPEC countries will likely have to break the deal and resume oil production and exports to avoid huge budget deficits, further lowering the oil price.

For every $1 the oil prices go down, the Russian government loses $2 billion in revenues. They will deplete their currency reserves in 2017 at this rate, and they will have to tap into their second currency reserve in 2018. This one is normally used for social security and pensions for Russian citizens, which might actually piss off a good number of Russians, especially in the outer regions which don't get a lot of economic growth (most of the the growth is in Moscow, St Petersburg etc).

If NATO countries actually increase their spending to 2%, and the US continues its NATO support under Trump, especially of Eastern Europe, then Russia will be forced to maintain their high military spending (over 5% of GDP) due to their paranoia over an invasion that will never happen.

This will cause more budgetary problems, cutbacks to social security and pensions, cut growth forecasts and might actually begin to destabilize Russia.