Regarding Sasha again no idea what's going on and what is the truth, there is a war going on between Olympiakos and Panathinaikos (Nunn rejected Oly offer last year, landed in Pana and led them to Euroleague and domestic title, along with Oly's former captain) so Pana's owner "threatened" to offer big contract to Sasha just to stick it to O(n)ly fans. Anyway it's a whole saga and nobody knows what is really happening. Sasha made no statements and the whole thing started again from Italian media, from Italy it was also when the "Sasha is leaving the Kings" whole thing started as well, no idea how and why.
Now regarding Duarte, he is one of the few players that have been with his NT from early preparation period despite his future being uncertain. Dominican Republic had big ambitions following a decent WC last year but KAT didn't make the trip nor Horford nor Quinones so Duarte is the top player and has been the leading scorer for his country in almost all friendlies having more than 20 points per match. His country though it's highly unlikely to qualify for the Olympic tournament being in the same group with Greece (and Egypt) and having to play in the semis (that they will most likely qualify beating Egypt) and the final later with Slovenia or Croatia that seem quite stronger. Doncic will be there btw. Duarte wasn't in the WC last year (Kings didn't let him?) but this time he seems commited to the cause.