The Polish foreign minister said he could not guarantee that Russian President Vladimir Putin's plane would not be forced to land.

President Donald Trump and Russian President Vladimir Putin are no longer meeting in Budapest as was announced just last week.

The latest round of discussions to find a resolution to Russia’s invasion of Ukraine have hit another standstill as the Kremlin digs in on its demands.

Moscow has rejected the possibility of a ceasefire in Ukraine, stating that this idea contradicts the agreement reached by Vladimir Putin and Donald Trump in Alaska. Yet the Kremlin still wants the second meeting between the two in Budapest to proceed.

Kremlin envoy Kirill Dmitriev floated the tunnel idea late on Thursday after Putin spoke to Trump by phone and agreed to meet in Budapest.

A weekend call between President Donald Trump and Ukrainian President Volodymyr Zelenskyy devolved into a "shouting match," and Russian state media pundits are now declaring it the result of Russian President Vladimir Putin's influence over Trump.

Donald Trump urged Volodymyr Zelenskyy to accept Russia’s terms for ending its war in a volatile White House meeting on Friday, warning that Vladimir Putin had said he would “destroy” Ukraine if it did not agree.

The denial came after a Financial Times report described a closed-door meeting at the White House that allegedly devolved into a “shouting match."