By Steve Holland and Nandita Bose WASHINGTON (Reuters) – U.S. President Joe Biden adopted a cautious attitude on Tuesday to Russian vows to redeploy forces around Kyiv as the United States and its allies began discussion on a potential new $500 million aid package for Ukraine. Speaking alongside Singapore Prime Minister Lee Hsien Loong, Biden said the economic sanctions that have hobbled the Russian economy would continue while the United States and its allies monitor what Moscow does with its forces. “We’ll see. I don’t read anything until it until we see what their actions are,” said Biden. …