The ICAO rules state that altitude is quoted in feet. The captain of an a/c may tell his passengers that he is flying at 11,000 meters but ATC will tell him he is flying at FL 390.
It is true that sometimes when pilots and ATC are not speaking English they may speak using meters BUT as far as I know in all non English speaking countries pilots must have an ICAO level 4 qualification in English before they can fly IRC.
So be content to use feet. It's the rule.
Vololiberista
Sorry, but you're just plain wrong.
ICAO states can rule exceptions to ICAO regulations, and Russia among others mentioned, is using a national METRIC SYSTEM for altitudes, speeds and flight levels. It's not just translating feet into meters due to communication reasons.
How that relates to PFE, is another thing.