@Walter Hinteler,
What did happen, however:
Ukrainian Defense Ministry spokesman Maksim Prauta said four Russian navy ships were blocking Ukraine's anti-submarine warship Ternopil and the command ship Slavutych in Sevastopol's harbour.He said the Russians ordered the crew to surrender within the hour or face Russians storming and seizing the ships and crew.
(Ternopil is an ex-Soviet Grisha V class (1124 ME) corvette; Slavutych was origianally built as a Soviet intelligence ship [sister to Russian Kamchatka] but completed as a communications/command ship.)