"I express my personal condolences to the families of those killed in the wars of the 1990s, including the NATO air campaign ... The Serbian people will never leave aside their grief, but I believe that they are strong enough to forget about their grievances," he wrote on Twitter.

Hill noted Washington's unwavering commitment to partnership with Belgrade and diplomacy.

According to him, the United States and Serbia together will be able to "build a better future that the Serbian people deserve."

Serbian President Aleksandar Vucic said earlier that the country is not a member of the North Atlantic Alliance for logical reasons.

According to him, in Serbia they want to "be themselves, not to interfere with anyone, not to take someone else's and not to hurt anyone."

Earlier, Russian Ambassador to Belgrade Alexander Botsan-Kharchenko noted that Belgrade's sovereign position on the issue of military-political neutrality is respected.