"Maintaining good relation with neighbouring countries is an important aspect of national security but we cannot jeopardise national security for the sake of maintaining good neighbourly relations," Oli said without elaborating on the issue.
"Neither we think against anyone nor we have spoken against anyone. We won't let this country be used against others. Competition should be for various other issues but not on national security," he said while addressing a National Security Seminar here.
The embattled leader's remarks came a day after a veteran Communist leader accused India of attempting to topple the Oli-led government in a bid to derail growing Nepal-China ties.
Opposition parties yesterday tabled a no-confidence motion against Oli after he refused to resign despite his coalition government being reduced to a minority, plunging the country into fresh political instability.
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He said the new Constitution could only be amended as no provision for rewriting is mentioned in it, a demand put forth by some agitating Madhesi leaders.
Oli said the government was ready to redraw the federal boundaries as per the demand of Terai-based political parties, "But such drawings should be a justifiable one".
Nepal Workers and Peasants Party Chairman Narayan Man Bijukchhe said Nepali Congress President Sher Bahadur Deuba and CPN (Maoist Centre) Chairman Prachanda were trying to topple the CPN-UML Chairman Oli-led government under the direction of the southern neighbour.