WASHINGTON (AP) — U.S. and NATO officials are trying to gauge whether to divert already dwindling resources and attention from Afghanistan as Russia pushes new hostilities to Europe’s doorstep.

NATO is intent on continuing its 12-year mission in Afghanistan and has urged the Kabul government to sign a security agreement allowing foreign troops to stay and train local forces beyond a Dec. 31 withdrawal deadline.

However, NATO states in Eastern Europe are openly worried about Russian aggression, especially after Moscow’s annexation this week of the strategic Crimean Peninsula from Ukraine. NATO may have little choice but to bolster its own borders at some cost of keeping a robust and diverse military presence a continent away.