Biden proposes summit, raises Ukraine escalation in call with Putin

• Biden expressed U.S. support for Ukraine, raised "concerns over the sudden Russian military build-up," and called on Russia to reduce tensions, per a White House readout.
• Biden also warned Putin against further "cyber intrusions and election interference."
• The two also discussed arms control.

The big picture: Biden has sought to balance his desire for a stable relationship with Russia — particularly when it comes to nuclear security — with his efforts to respond to Russian moves like the jailing of opposition leader Alexei Navalny.

What to watch: The summit Biden proposed would cover "the full range of issues facing the United States and Russia," per the readout.