Once again the Trump administration has indicated that it is not going to follow a pro-Russia line. Pushing for NATO to expand into Montenegro represents yet another hostile move by the US-dominated alliance. Montenegro is part of the Orthodox-Slavic orbit that has historically been allied to and dependent upon Moscow.
The US is rushing to consolidate and finish the project it started in the 1990s... bringing all of Europe under its sway. Ironically the last few places that are not either in the EU, NATO or both lie in the Balkans. Due to their volatile and convoluted history these are the locations, just like a century ago, that are most easily turned into firestorms.
Will Putin make trouble? Will he flood the forces of agitation with money and possibly arms? Most likely. What does he have to lose? The US laid its cards on the table long ago. If the tables were turned the US would do the same. It wouldn't be the first time.
Trump's meeting with NATO members in May will be of the utmost importance. By the conclusion of that meeting, sure to be accompanied by massive protests, Trump's position will be clear. If Brussels is normally a city of intrigue you can be sure that many governments (Russia included of course) will be keen to learn what they can from the goings on and backroom discussions at that summit. This meeting will set policy with regard to Ukraine as well as the posture of NATO along Russia's western frontier. In addition the alliance will have some indication as to Trump's direction with regard to Libya and other questions that have been lingering in the background.
This NATO summit will probably the most important since the 1990s when NATO found its new raison d'être in the Balkan Wars.