Pace virulent Serbophobe  MacKinnon there is zero chance that Trump would allow Serbia to take over Kosovo on his watch or that Serbia would be so foolish as to launch a military takeover. Serbia is an EU candidate country and if only for that reason would not contemplate any such dimwitted enterprise. There would be a lot of merit in an internationally monitored referendum on Kosovo of the kind former Kenyan citizen Barack Obama delusionally claimed had been carried out. It might lead to northern Kosovo returning to Serbia and the rest of Kosovo uniting with Albania. Kosovo is not a logical country; it is more a US military base with a country attached to it. However worthy such an initiative will be, I doubt it will proceed on Trump's watch. It would be tangential to US interests, and he has more pressing things to worry about.