The call between Trump and Putin comes just one day after Washington indirectly aided Putin’s war effort against Ukraine by suspending some shipments of air defense missiles, artillery shells and other weapons as part of what Pentagon officials have described as a pause of arms shipments globally while the U.S. replenishes its own stockpiles.

The U.S. has provided a number of weapons systems and millions of rounds of ammunition to help Ukraine beat back Russia’s invasion. Last week, President Donald Trump said at a NATO summit that he was open to sending the Ukrainians more Patriot air defense systems.