This is what's going, they're having a dick fight.

Medvedev:

“Trump’s playing the ultimatum game with Russia: 50 days or 10 … He should remember 2 things: 1. Russia isn’t Israel or even Iran. 2. Each new ultimatum is a threat and a step towards war,” Medvedev blasted on social media earlier this week. “Not between Russia and Ukraine, but with his own country. Don’t go down the Sleepy Joe road!”

Trump:

“Russia and the USA do almost no business together. Let’s keep it that way, and tell Medvedev, the failed former President of Russia, who thinks he’s still President, to watch his words. He’s entering very dangerous territory!” Trump wrote in the early hours of Thursday morning.

Medvedev:

“It’s not for you or Trump to dictate when to ‘get at the peace table’. Negotiations will end when all the objectives of our military operation have been achieved. Work on America first, gramps!” Medvedev fumed.

etc. Source