Former Director for European and Eurasian Affairs at the U.S. National Security Council, diplomat Matthew Bryza said this in an interview with Espreso TV .He answered the question of where Trump can push to make Moscow extremely painful, so that it would actually change its aggressive policy.“I think there’s a very clear step, and that would be to apply massive sanctions on any country that buys Russian oil and natural gas. That would be politically painful for Trump because he really likes Narendra Modi, and India consumes a large amount of Russian oil,” Bryza said.The diplomat believes that such a move would also complicate trade negotiations with China and likely reduce the chances of reaching new agreements.“But as president, Trump would have to make those kinds of difficult decisions and weigh the trade-offs. If Russia is cut off from significant oil and gas revenues, then its sovereign wealth funds and rainy-day reserves will eventually run out.An economy that has been completely retooled for producing weapons will no longer be able to function at the current pace, because there will be no more money to pay workers or buy raw materials. So for me, the biggest step is to eliminate as much of Russia’s oil revenue as possible,”  he summarized.