Problem: Create a 140-character tweet with the following story: " NEW YORK, June 6 (Reuters) - A U.S. court on Monday issued warrants for the seizure of two luxury planes owned by Russian billionaire Roman Abramovich under U.S. measures imposed after Russia's invasion of Ukraine, court records showed. But the U.S. government's likelihood of gaining control of the aircraft worth nearly $400 million was uncertain. A Department of Justice official said the $350 million Boeing 787 Dreamliner and $60 million Gulfstream G650 ER were not in U.S. custody, and the official declined to say if the U.S. government knows their locations. A federal judge in Manhattan issued the warrants on the grounds that recent flights violated U.S. export controls imposed after Russia's invasion of Ukraine in February. The U.S. Department of Commerce filed related administrative charges against Abramovich. But the official said the warrants are likely to dissuade companies from helping to move the aircraft. U.S. authorities are seeking to pressure business leaders close to Russian President Vladimir Putin to get him to halt what Kremlin calls its "special military operation" in Ukraine. A spokesperson for Abramovich did not immediately respond to a request for comment. Abramovich has denied having close ties to Putin." Need Assignment Help?