Greece will receive hard-hitting Russian weapons, Vladimir Putin told a joint press conference with Greek Prime Minister. However, Putin acknowledged the problem of compatibility of Russian and NATO weapons. But the weapons' combat efficiency is also very important, Putin stressed. It was Greek Prime Minister Konstantinos Simitis who touched upon the problem of compatibility of Russian and NATO weapons. Those taking part in the tender should ensure maximum possible compatibility of specific weapons' systems; the winner will be chosen in line with this criterion, the Prime Minister stressed. There are some economic criteria, Simitis added.