 The lowered threshold for use of nuclear weapons by Russia is disputed by other experts.Ten NATO member countries have advanced a confidence-building plan for NATO and Russia that could lead to treaties to reduce the tactical nuclear weapons in Europe.However, in the meantime, NATO is moving forwards with a plan to upgrade its tactical nuclear weapons with precision guidance that would make them equivalent to strategic weapons in effects against hardened targets, and to carry them on stealth aircraft that are much more survivable against current air defenses.