For static base defence the Soviets and Russians have traditionally gone for a combination of weapons depending upon the geography of the region. ZU-23 towed twin barrel 23mm cannons generally being the most popular with their dual surface to air and surface to surface role. Where targets can appear at distance the SPG-9 recoilless rifle is also used as is the Plamya AGS-17 for fixed base defence.
Regarding the 14.5mm, it certainly is a very powerful round, but I doubt the west will adopt such a round no matter how good it might be. They simply don't have the infrastructure to support such a calibre and no pressing need to spend the money necessary to get the capability. Any role the 14.5mm round might fill would be filled within NATO by light 20mm calibres. Generally worse kinetic power, but with better HE capacity making up for that.