President Vladimir Putin of Russia said he agrees in essence to a 30-day U.S.-backed cease-fire in his war in Ukraine, while voicing concerns over what he described as "nuances" as he seeks concessions from Kyiv.

Putin made his first public comments on Ukraine's willingness to negotiate a ceasefire, thanking world leaders for their efforts in addressing the conflict.

The US-proposed ceasefire deal was first accepted by Ukraine on March 11, after it expressed willingness to accept the same post the US-Ukraine peace talks in Jeddah, Saudi Arabia.