First Lady Melania Trump may have had a hand in convincing her husband that President Vladimir Putin was not negotiating in good faith, leading him to issue his latest ultimatum against Russia on Ukraine.

Frustrated with the lack of progress on a peace deal, President Donald Trump announced on Monday that he would slap Russia with 100 percent tariffs in 50 days if Putin failed to reach an agreement during a meeting with North Atlantic Treaty Organization (NATO) Secretary General Mark Rutte at the White House.

“We’ve very, very unhappy with them, and we’re going to be doing very severe tariffs if we don’t have a deal in 50 days,” Trump said. “Tariffs at about 100 percent. You call them secondary tariffs.”

During the meeting, the president described conversations with his wife as he negotiated with Putin over the last several months, when Trump would report on “pleasant” conversations with the Russian leader—only to be undercut by Putin’s continued aggression in Ukraine.