One week after his election victory, President-elect Donald Trump’s relationship with Russian Pres. Vladimir Putin is already drawing scrutiny. During the campaign, Trump claimed he could end the war in Ukraine “in one day,” and recent reports suggest he’s taken early steps to engage with key players in the conflict.

According to sources cited by the Washington Post, Trump spoke with Putin last Thursday from Mar-a-Lago, Fla., urging him not to escalate the war in Ukraine and reminding him of the strength of U.S. military deployments in Europe. Trump also expressed a desire to pursue peace on the European continent and follow-up discussions to resolve the war “as soon as possible.”

The Kremlin, Putin, has said that a phone call took place. Nikolai Patrushev, an aide to Putin and former director of Russia’s Federal Security Service said in an interview with the Russian newspaper Kommersant that Trump relied on certain forces during the election campaign and would have obligations to fulfill.

Trump also reportedly had a separate phone call with Ukrainian President Volodymyr Zelensky earlier in the week. While details of that conversation remain undisclosed, Trump’s past remarks about Ukraine, NATO and military aid have raised questions about how he will approach the ongoing conflict. During his presidency, Trump criticized U.S. support for Ukraine, described Zelensky as a “salesman,” and was impeached in 2019 following a controversial phone call with Zelensky.

Trump’s campaign rhetoric about fostering better relations with Putin faces its first test against the backdrop of an intensifying conflict. Russia has recently signaled plans to deploy more troops to the region, including North Korean soldiers, to reclaim territory in Ukraine’s Donbas province. Analysts question whether Trump’s attempts to leverage his personal relationship with Putin will yield any significant results.