While the U.S. Department of Defense continues to hold weekly briefings with the media, some military experts now suspect that some more sophisticated weapon technology donations given to Ukrainians are being kept a secret from the world.

“It is what is not being talked about that could prove most important [to Ukraine’s war efforts],” according to 27-year veteran British Army tank commander Justin Crump, who was on the ground in Kyiv in July.

“Ukraine has more aircraft than it used to and better systems — this shouldn’t be happening six months into a war with Russia.”