Russia's Constitutional Court chairman, Valery Zorkin, said Wednesday the treaty signed by Putin has been ruled valid, meaning it now only requires ratification by the Russian parliament.
On Wednesday morning, militiamen under apparent Russian command barged their way into Ukraine's naval headquarters in Sevastopol, detaining the head of Ukraine's navy and seizing the facility. The incursion, which Ukraine's Defense Ministry described as being led by a self-described local defense force, Cossacks and "aggressive women," proceeded with no resistance.
Upon gaining entrance to the base, the storming party raised a Russian flag on the headquarters square.
The unarmed militiamen waited for an hour on the square and, following the arrival of the commander of the Russian Black Sea Fleet, they took over the building.
By afternoon, they were in full control of the naval headquarters, a set of three-story white concrete buildings with blue trim.
The Ukrainian Defense Ministry said Rear Adm. Sergei Haiduk was detained and a news agency close to the Russian-backed local authorities reported that he had been summoned for questioning by prosecutors. Later in the day, Russian Defense Minister Sergei Shoigu ordered the Crimean authorities to release Haiduk.
With thousands of Ukrainian soldiers and sailors trapped on military bases, surrounded by heavily armed Russian forces and pro-Russia militia, the Kiev government said it was drawing up plans to evacuate its outnumbered troops from Crimea back to the mainland and would seek U.N. support to turn the peninsula into a demilitarized zone.
"We are working out a plan of action so that we can transfer not just servicemen, but first of all, members of their family who are in Crimea, quickly and effectively to mainland Ukraine," said Andriy Parubiy, secretary of Ukraine's National Security and Defense Council.
Parubiy also announced Ukraine would hold military maneuvers with the United States and Britain, signatories, along with Russia, of the 1994 Budapest Memorandum. He provided no details.