To make a nice gesture since the Russians have used it for about 200 years. More recently, before 2014, they were paying Ukraine to lease the base. Maybe Ukraine will see it as a major threat after all of this but until recently they did accept the Russians there. (Maybe just to keep the peace?)
"The construction of the port started in 1772, while the
Russo-Turkish War (1768–1774), was still ongoing, and was finished in 1783, following the
annexation of Crimea by the Russian Empire. On 13 May 1783, the first eleven ships of the
Imperial Russian Navy reached the
Sevastopol Bay.
[2]
During the
Crimean War (1853–1856), all large ships were
scuttled in the entrance to the bay in 1854 to prevent the entry of enemy ships into the bay. The city
defended itself for 349 days against the allied armies of
France,
United Kingdom,
Ottoman Empire and
Piedmont-Sardinia. Eventually, the Russians had to abandon Sevastopol on 9 September 1855.
[2]
During
World War I, the
Imperial German Army occupied Sevastopol on 1 May 1918 despite the ongoing negotiations to reach the
Treaty of Brest-Litovsk. After further negotiations, the most important ships of the Black Sea Fleet in
Tsemes Bay in front of
Novorossiysk were sunk by their crews.
[2]
During
World War II, the Black Sea Fleet of the
Soviet Navy was able to fend off the first air attack by the
Nazi German Luftwaffe. However, after the city
defended itself for 250 days, Sevastopol fell to the Germans on 4 July 1942.
[2]
After the
dissolution of the Soviet Union at the end of 1991, the claim of the now
Russian Navy for use of the naval base was initially lost (since Crimea was
transferred to the
Ukrainian SSR in 1954, the base was on the soil of the new
post-Soviet state
Ukraine). From then on,
Russia paid an annual lease to Ukraine for the use of the base until 2014, as regulated by the
Partition Treaty on the Black Sea Fleet and the
Kharkiv Pact.
[3][4] Since the
annexation of Crimea by the Russian Federation in 2014, the naval base is again under Russian control.
[5]"
WIKI