source https://www.cnn.com/2021/03/31/politics/us-russia-ukraine-calls/index.html
Top US national security officials call counterparts as Russia and Ukraine tensions rise
Top US national security officials have spoken with their Ukrainian counterparts, and America's top general held a call Wednesday with his Russian opposite number amid concern over Russian military activity in Crimea and eastern Ukraine, including what the US deemed a violation of a ceasefire by Moscow that led to the deaths of four Ukrainian soldiers last week.
source https://www.cnn.com/2021/03/31/politics/us-russia-ukraine-calls/index.html
source https://www.cnn.com/2021/03/31/politics/us-russia-ukraine-calls/index.html