<sod >The Nato Secretary General, Anders Fogh Rasmussen, cautioned Russia ânot to take any action that can escalate tension or create misunderstanding.< eod>< sod > The Nato Secretary General, Anders Fogh Rasmussen, cautioned Russia "not to take any action that can escalate tension or create misunderstanding." Ukraine's acting President, Olexander Turchynov said any "military movement" by Russia's Black Sea Fleet beyond its base "will be seen by us as an act of military aggression".< eod>