Ukraine will officially join the World Trade Organization May 16, the Geneva-based trade body said Thursday.
The former Soviet republic ratified its accession Apr. 10 and the WTO said it received formal notification late Wednesday.
"Ukraine will be a member in 30 days" from Apr. 16, the WTO said in a statement.
Ukraine, which with Russia and Iran is one of the last large countries still outside the WTO, secured a membership invitation in February after 15 years of talks.
Analysts say membership will give Ukraine a say in the ongoing entry talks of giant neighbor Russia. The two have frequently been embroiled in politicized disputes over their energy trade.
In January, President Viktor Yushchenko told AFP he intended to use Ukraine's membership to reinforce Kiev's position in economic disputes with Moscow.