This is reported by the publication Semafor, referencing Western officials familiar with the negotiations.
The specific options being considered are not detailed by the sources. However, earlier reports indicated that Kellogg is one of Trump's allies who aims to pressure Russia rather than Ukraine, in order to encourage Russian leader Vladimir Putin to retreat.
Additionally, some media speculated that Kellogg intends to present a plan for resolving the war in Ukraine during the Munich Security Conference from February 14-16. However, he himself denied this, explaining that Trump's plan will be presented by Trump himself.
Kellogg has stated that he aims to find a solution to the war within 100 days after the inauguration of the new U.S. president. Recently, he mentioned that months, not years, are needed to initiate peace negotiations between Russia and Ukraine rather than years.