Question: With which sovereign state in the Lesser Antilles is the Pyotr Lebedev registered?

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Tropical Storm Chris (1988): Tropical Storm Chris caused minor flooding in the Greater Antilles and the Eastern United States in August 1988.  The seventh tropical cyclone and third named storm of the annual hurricane season, Chris developed from a tropical wave while roughly midway between Africa and the Lesser Antilles on August 21.  Forming as a tropical depression, it remained weak for several days, crossing the Lesser Antilles, Hispaniola, and The Bahamas during this time.  While offshore the coast of Florida on August 28, the depression intensified into Tropical Storm Chris.  Thereafter, the system tracked rapidly north-northwestward and came ashore near Savannah, Georgia later that day.  Once inland, Chris quickly weakened, and by early on the following day, it weakened to a tropical depression over South Carolina.  Six hours later, Chris was absorbed by a cold front while over North Carolina, though the remnants of the system tracked across the Eastern United States and Atlantic Canada before dissipating on August 30.

Pyotr Lebedev (research vessel): Pyotr Lebedev is a research vessel, built at Wärtsilä Crichton-Vulcan in Turku, Finland, originally as a merchant vessel "Chapayev" in 1957.  She was subsequently acquired for the Soviet Union and refitted as a research ship.  The vessel was owned and operated by the Andreev Acoustics Institute, and was used to make hydrophysical observations of the Atlantic Ocean such as during the Polygon experiment.  "Pyotr Lebedev" possessed five on-board laboratories used to study hydroacoustics, hydrology, hydrobiology, hydrochemistry, and electronics.  The ship was active as a research vessel from 1967 until 1977.  She is current registered in Saint Vincent and the Grenadines.

1909 Atlantic hurricane season: The 1909 Atlantic hurricane season was an average Atlantic hurricane season.  The season produced eleven tropical cyclones, of which all eleven became tropical storms; six became hurricanes, and four of those strengthened into major hurricanes.  The season's first storm developed on June 15 while the last storm transitioned into an extratropical cyclone on November 14.  The most notable storm during the season formed in late August, while east of the Lesser Antilles.  The hurricane devastated the Lesser Antilles, the Greater Antilles, and Mexico, leaving around 4,000 fatalities and more than $50 million (1909 USD) in damage.

1963 Atlantic hurricane season: The 1963 Atlantic hurricane season featured one of the deadliest tropical cyclones on record in the Atlantic basin: Hurricane Flora.  The season officially began on June 15, and lasted until November 15.  These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin.  It was a near-average season in terms of tropical storms, with a total of nine named storms.  The first system, Hurricane Arlene, developed between Cape Verde and the Lesser Antilles on July 31.  The storm later impacted Bermuda, where strong winds resulted in about $300,000 (1963 USD) in damage.  Other storms such as hurricanes Beulah and Debra, as well as an unnamed tropical storm, did not impact land.  During the month of September, Hurricane Cindy caused wind damage and flooding in Texas, leaving three deaths and approximately $12.5 million in damage.  Hurricane Edith passed through the Lesser Antilles and the eastern Greater Antilles, causing 10 deaths and about $43 million in damage, most of which occurred on Martinique.

Lesser Antilles Volcanic Arc: The Lesser Antilles Volcanic Arc is a volcanic arc that forms the eastern boundary of the Caribbean Plate.  It is part of a subduction zone, also known as the Lesser Antilles subduction zone, where the oceanic crust of the South American Plate is being subducted under the Caribbean Plate.  This subduction process formed a number of volcanic islands, from the Virgin Islands in the north to the islands off the coast of Venezuela in the south.  The Lesser Antilles Volcanic Arc includes seventeen active volcanoes, notably Soufriere Hills on Montserrat; Mount Pelée on Martinique; La Grande Soufrière on Guadeloupe; Soufrière Saint Vincent on Saint Vincent; and the submarine volcano Kick 'em Jenny which lies about 10 km north of Grenada.

Leeward Antilles: The Leeward Antilles (Dutch: "Benedenwindse Eilanden") are a chain of islands in the Caribbean – specifically, the southerly islands of the Lesser Antilles (and, in turn, the Antilles and the West Indies) along the southeastern fringe of the Caribbean Sea, just north of the Venezuelan coast of the South American mainland.  The Leeward Antilles, while among the Lesser Antilles, are not to be confused with the Leeward Islands (also of the Lesser Antilles) to the northeast.

Saint Vincent and the Grenadines: Saint Vincent and the Grenadines ( ) is a sovereign state in the Lesser Antilles island arc, in the southern portion of the Windward Islands, which lie at the southern end of the eastern border of the Caribbean Sea where the latter meets the Atlantic Ocean.  The country is also known simply as Saint Vincent.

Lesser Antilles: The Lesser Antilles (also known as the Caribbees) are a group of islands in the Caribbean Sea.  Most form a long, partly volcanic island arc between the Greater Antilles to the north-west and the continent of South America.  The islands form the eastern boundary of the Caribbean Sea with the Atlantic Ocean.  Together, the Lesser Antilles and the Greater Antilles compose the Antilles (or the Caribbean in its narrowest definition).  When combined with the Lucayan Archipelago, all three are known as the West Indies.

Music of the Lesser Antilles: The music of the Lesser Antilles encompasses the music of this chain of small islands making up the eastern and southern portion of the West Indies.  Lesser Antillean music is part of the broader category of Caribbean music; much of the folk and popular music is also a part of the Afro-American musical complex, being a mixture of African, European and indigenous American elements.  The Lesser Antilles' musical cultures are largely based on the music of African slaves brought by European traders and colonizers.  The African musical elements are a hybrid of instruments and styles from numerous West African tribes, while the European slaveholders added their own musics into the mix, as did immigrants from India.  In many ways, the Lesser Antilles can be musically divided based on which nation colonized them.

Lebedev Physical Institute: The Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS) (in Russian: Физи́ческий институ́т имени П.Н.Ле́бедева Российской академии наук (ФИАН) ), situated in Moscow, is one of the leading Russian research institutes specializing in physics.  It is also one of the oldest research institutions in Russia: its history dates back to a collection of physics equipment established by Peter the Great in the Kunstkamera of Saint Petersburg in 1714.  The institute was established in its present shape in 1934 by academician Sergey Vavilov.  It moved to Moscow and was named after a prominent Russian physicist Pyotr Lebedev the same year.  It is also known as Lebedev Institute of Physics or just Lebedev Institute.  In Russian it is often referred to by the acronym FIAN (ФИАН) standing for "Physical Institute of the Academy of Sciences".

Supporting paragraphs: Pyotr Lebedev (research vessel) Saint Vincent and the Grenadines
Answer: Saint Vincent and the Grenadines