We must not fool ourselves and think that the new American President Trump will be a real friend of Russia. He will work to "make America great again", and that contradicts any wishes of substantially better relations with Russia.
The main theories explaining the rationale of the foreign sponsored invasion of Syria, disingenuously labeled as a “Civil War” include:
Russia will continue to “clean house” in removing or functionally neutralizing unipolar-linked elements in the country whether through public or discrete actions, and this will empower the country to more assuredly practice its multi-vectored diplomacy of geopolitical balancing and thus strengthen its position as the core of the emerging Multipolar World Order.
The Eurasian Heartland can expect to immensely benefit from the Russian- and Chinese-led integrational projects being advanced in this region