Sure!
let me post a screenshot of the world and the alliances
Legend: Red: Moscow pact, Dark blue: NATO, Light blue: NPTO, Dark red: U.S.A partially restored communications and civil war, Dark grey: Unknown status on these countries, Grey: countries without alliances
Year: 2020
Technology level: Modern and near future
Major Events
2001 - NPTO North Pacific Treaty Orginization forms Japan, Australia, Indonesia as the leading countries
2007 - the American, Canadian and Mexican power grids fail
2008 - Moscow pact was formed Russia, China, North-Korea as the Major powers
2014 - North-Korea invades South-Korea Russia does not support, China does support
2015 - NPTO invades Chinese mainland
2016 - Slovada Joins NATO
2018 - Garbeld transmission from Canada reach Slovada, NATO sends recon to U.S.A. 'Survivors' found America appears to be in a Civil war, status Canada and Mexico still Unknown. Communications partially restored with U.S.A.
This is just a small piece to understand what weapons will be used - mostly conventional