The US president says Russia's Vladimir Putin would face a "rough situation" if he doesn't co-operate in the peace process.

U.S. and European military planners have begun exploring post-conflict security guarantees for Ukraine, U.S. officials and sources told Reuters on Tuesday, following President Donald Trump's pledge to help protect the country under any deal to end Russia's war.

Security guarantees have become a central focus in discussions about a peace deal for Ukraine, with the country’s President Volodymyr Zelensky saying at the White House Monday that they are the “key issue,