By David Lawder and Katharine Jackson WASHINGTON (Reuters) -Senior U.S. officials on Sunday said they could not confirm reports that U.S. intelligence indicates that Russia is planning to invade Ukraine on Wednesday, but said they would try to prevent any “surprise attack” by sharing what they knew of Russia’s plans. White House National Security Adviser Jake Sullivan repeated that a Russian invasion https://graphics.reuters.com/RUSSIA-UKRAINE/dwpkrkwkgvm could begin any day and President Joe Biden has said he will support Ukraine after any invasion and defend NATO territory. “We cannot perfec…