Serbia has announced it is buying one of the most powerful air-defence systems in Europe - China's HQ-9. President Aleksandar Vucic announced the purchase during a display of military hardware at Batajnica airport: „We're now buying the HQ-9, and probably something else too."

According to the military-analysis portal Military Watch, with this system Serbia could field air defence with a range of up to 300 kilometres - more than the American „Patriot" (200 km) and the French SAMP/T NG (150 km), and with greater mobility than its Western equivalents. On paper, that means the ability to create broad no-fly zones over the region.

This is where it pays to stay sober. „Americans on edge" and „a weapon that changes everything" are headlines, not facts - there is no official reaction from Washington, only an analysis from a specialist portal. Still, the point is real: a Balkan country that is not a NATO member is buying top-tier Chinese weaponry, right in the middle of a region ringed by alliance members.

For the neighbours this is not just a technical question. When one Balkan state arms its skies with Chinese technology while another sits under the NATO umbrella, the balance of power in the region quietly shifts. The question is not whether Serbia has the right to arm itself - every state does - but where the race leads when every neighbour wants to be stronger than the next.