Russia is extending military drills near Ukraine's northern borders after two days of sustained shelling along the contact line between Ukrainian soldiers and Russia-backed separatists in eastern Ukraine.
Ursula Von Der Leyen, President of the European Commission, says Russia would have its access to financial markets and high-tech goods limited if it attacks Ukraine.
Poland is the largest European Union nation to border Ukraine and the government is making preparations to accept Ukrainian refugees if Russian attacks.
U.S. President Joe Biden and Russian President Vladimir Putin plan to hold a high-stakes telephone call on Saturday to discuss mounting tensions over Ukraine.