Washington, July 31 -- United States President Donald Trump on Friday stated that Washington must exercise caution regarding proposals to permit Ukraine to manufacture Patriot interceptor missiles, signalling potential ambiguity over a licence previously indicated for Kyiv to reinforce its air defence capabilities.

Addressing reporters at the Camp David presidential retreat, Trump indicated that a final determination has not been reached on whether Ukraine will be allowed to produce one of the US military's most advanced air defence systems.

"These weapons are incredible. We have to be very careful about letting somebody build them," Trump stated.

The comments echoed remarks made during an interview with the Financial Times, where Trum...